8    Configuring a Shared SCSI Bus for Tape Drive Use

The topics in this section provide information on preparing the various tape devices for use on a shared SCSI bus with the TruCluster Server product. The topics discussed include preparing the following tape drives for shared SCSI bus usage:

• TZ88 (Section 8.1)

• TZ89 (Section 8.2)

• Compaq 20/40 GB DLT Tape Drive (Section 8.3)

• Compaq 40/80-GB DLT Drive (Section 8.4)

• TZ885 (Section 8.5)

• TZ887 (Section 8.6)

• TL891 and TL892 DLT MiniLibraries (Section 8.7)

• TL890 DLT MiniLibrary Expansion Unit (Section 8.8)

• TL894 DLT Automated Tape Library (Section 8.9)

• TL895 DLT Automated Tape Library (Section 8.10)

• TL893 and TL896 Automated Tape Libraries (Section 8.11)

• TL881 and TL891 DLT MiniLibraries (Section 8.12)

• Compaq ESL9326D Enterprise Library (Section 8.13)

Notes

Section 8.7 and Section 8.8 provide documentation for the TL890/TL891/TL892 MiniLibrary family as sold with the DS-TL891-NE/NG, DS-TL891-NT, DS-TL892-UA, DS-TL890-NE/NG part numbers.

The TL881, with a Compaq 6-3 part number was recently qualified in cluster configurations. The TL891 rackmount base unit has been provided with a Compaq 6-3 part number. The TL881 and TL891 only differ in the type of tape drive they use. They both work with an expansion unit (previously called the DS-TL890-NE) and a new module called the data unit.

Section 8.12 covers the TL881 and TL891 with the common components as sold with the Compaq 6-3 part numbers.

As long as the TL89x MiniLibrary family is being sold with both sets of part numbers, the documentation will retain the documentation for both ways to configure the MiniLibrary.

8.1    Preparing the TZ88 for Shared Bus Usage

Two versions of the TZ88 are supported: the TZ88N-TA tabletop standalone enclosure, and the TZ88N-VA StorageWorks building blocks (SBB) 13.34-centimeter (5.25-inch) carrier.

As with any of the shared SCSI devices, the TZ88N-TA and TZ88N-VA SCSI IDs must be set to ensure that no two SCSI devices on the shared SCSI bus have the same SCSI ID.

The following sections describe preparing the TZ88 in more detail.

8.1.1    Setting the TZ88N-VA SCSI ID

You must set the TZ88N-VA switches before the tape drive is installed into the BA350 StorageWorks enclosure. The Automatic selection is normally used. The TZ88N-VA takes up three backplane slot positions. The physical connection is in the lower of the three slots. For example, if the tape drive is installed in slots 1, 2, and 3 with the switches in Automatic, the SCSI ID is 3. If the tape drive is installed in slots 3, 4, and 5 with the switches in Automatic, the SCSI ID is 5. The switch settings are listed in Table 8-1. Figure 8-1 shows the TZ88N-VA with the backplane interface connector and SCSI ID switch pack.

Figure 8-1:  TZ88N-VA SCSI ID Switches

Table 8-1:  TZ88N-VA Switch Settings

8.1.2    Cabling the TZ88N-VA

There are no special cabling restrictions specific to the TZ88N-VA; it is installed in a BA350 StorageWorks enclosure. A DWZZA-VA installed in slot 0 of the BA350 provides the connection to the shared SCSI bus. The tape drive takes up three slots.

You must remove the DWZZA-VA differential terminators. Ensure that DWZZA-VA jumper J2 is installed to enable the single-ended termination. The BA350 jumper and terminator must be installed.

A trilink connector on the DWZZA-VA differential end allows connection to the shared bus. An H879-AA terminator is installed on the trilink for the BA350 on the end of the bus to provide shared SCSI bus termination.

Figure 8-2 shows a TruCluster Server cluster with three shared SCSI buses. One shared bus has a BA350 with a TZ88N-VA at SCSI ID 3.

Figure 8-2:  Shared SCSI Buses with SBB Tape Drives

Table 8-2 lists the components that are used to create the cluster that is shown in Figure 8-2.

Table 8-2:  Hardware Components Used to Create the Configuration Shown in Figure 8-2

8.1.3    Setting the TZ88N-TA SCSI ID

The TZ88N-TA SCSI ID is set with a push-button counter switch on the rear of the unit. Push the button above the counter to increment the address; push the button below the counter to decrement the address until you have the desired SCSI ID selected.

8.1.4    Cabling the TZ88N-TA

You must connect the TZ88N-TA tabletop model to a single-ended segment of the shared SCSI bus. It is connected to a differential portion of the shared SCSI bus with a DWZZA-AA or DWZZB-AA. Figure 8-7 shows a configuration of a TZ885 for use on a shared SCSI bus. You can replace the TZ885 shown in the illustration with a TZ88N-TA. To configure the shared SCSI bus for use with a TZ88N-TA, follow these steps:

1. You will need one DWZZA-AA or DWZZB-AA for each TZ88N-TA.

   Ensure that DWZZA jumper J2 or DWZZB jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Attach a trilink connector to the differential end of the DWZZA or DWZZB.

3. Connect the single-ended end of a DWZZA to the TZ88N-TA with a BC19J cable.

   Connect the single-ended end of a DWZZB to the TZ88N-TA with a BN21M cable.

4. Install a H8574-A or H8890-AA terminator on the other TZ88N-TA SCSI connector.

5. Connect a trilink or Y cable to the differential shared SCSI bus with BN21K, BN21L, or 328215-00X cables. Ensure that the trilink or Y cable at the end of the bus is terminated with an H879-AA terminator.

The single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with BC19J cables as long as the SCSI bus maximum length is not exceeded. Ensure that the tape drive on the end of the bus is terminated with a H8574-A or H8890-AA terminator.

You can add additional TZ88N-TA tape drives to the differential shared SCSI bus by adding additional DWZZA or DWZZB/TZ88N-TA combinations.

Note

Ensure that there is no conflict with tape drive, system, and disk SCSI IDs.

8.2    Preparing the TZ89 for Shared SCSI Usage

Like the TZ88, the TZ89 comes in either a tabletop (DS-TZ89N-TA) or a StorageWorks building block (SBB) 13.34-centimeter (5.25-inch) carrier (DS-TZ89N-VW). The SBB version takes up three slots in a BA356 StorageWorks enclosure.

The following sections describe how to prepare the TZ89 in more detail.

8.2.1    Setting the DS-TZ89N-VW SCSI ID

The DS-TZ89N-VW backplane connector makes a connection with the backplane in the middle of the three slots occupied by the drive. If the switches are set to automatic to allow the backplane position to select the SCSI ID, the ID corresponds to the backplane position of the middle slot. For example, if the DS-TZ89N-VW is installed in a BA356 in slots 1, 2, and 3, the SCSI ID is 2. If it is installed in slots 3, 4, and 5, the SCSI ID is 4. Figure 8-3 shows a view of the DS-TZ89N-VW showing the backplane interface connector and SCSI ID switch pack.

Figure 8-3:  DS-TZ89N-VW SCSI ID Switches

The SCSI ID is selected by switch positions, which must be selected before the tape drive is installed in the BA356. Table 8-3 lists the switch settings for the DS-TZ89N-VW.

Table 8-3:  DS-TZ89N-VW Switch Settings

8.2.2    Cabling the DS-TZ89N-VW Tape Drives

No special cabling is involved with the DS-TZ89N-VW because it is installed in a BA356 StorageWorks enclosure. A DWZZB-VA installed in slot 0 of the BA356 provides the connection to the shared SCSI bus.

You must remove the DWZZB-VW differential terminators. Ensure that jumpers W1 and W2 are installed to enable the single-ended termination. The BA356 jumper must be installed, and connector JB1 on the personality module must be left open to provide termination at the other end of the single-ended bus.

A trilink connector on the differential end of the DWZZB-VW allows connection to the shared bus. If the BA356 containing the DS-TZ89N-VW is on the end of the bus, install an H879-AA terminator on the trilink for that BA356 to provide termination for the shared SCSI bus.

Figure 8-2 shows a TruCluster Server cluster with three shared SCSI buses. One shared bus has a BA356 with a DS-TZ89N-VW at SCSI ID 2.

Table 8-2 lists the components that are used to create the cluster that is shown in Figure 8-2.

8.2.3    Setting the DS-TZ89N-TA SCSI ID

The DS-TZ89N-TA has a push-button counter switch on the rear panel to select the SCSI ID. It is preset at the factory to 15. Push the button above the counter to increment the SCSI ID (the maximum is 15); push the button below the switch to decrease the SCSI ID.

8.2.4    Cabling the DS-TZ89N-TA Tape Drives

You must connect the DS-TZ89N-TA tabletop model to a single-ended segment of the shared SCSI bus. It is connected to a differential portion of the shared SCSI bus with a DWZZB-AA. Figure 8-7 shows a configuration of a T885 for use on a shared SCSI bus. Just replace the TZ885 in the figure with a DS-TZ89N-TA and the DWZZA-AA with a DWZZB-AA. To configure the shared SCSI bus for use with a DS-TZ89N-TA, follow these steps:

1. You will need one DWZZB-AA for each DS-TZ89N-TA.

   Ensure that the DWZZB jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Attach a trilink connector to the differential end of the DWZZB-AA.

3. Connect the DWZZB-AA single-ended end to the DS-TZ89N-TA with a BN21K, BN21L, or 328215-00X cable.

4. Install an H879-AA terminator on the other DS-TZ89N-TA SCSI connector.

5. Connect the trilink to the differential shared SCSI bus with BN21K, BN21L, or 328215-00X cables. Ensure that the trilink at the end of the bus is terminated with an H879-AA terminator.

The wide, single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with BN21K, BN21L, or 328215-00X cables as long as the SCSI bus maximum length is not exceeded. Ensure that the tape drive on the end of the bus is terminated with an H879-AA terminator.

You can add additional DS-TZ89N-TA tape drives to the differential shared SCSI bus by adding additional DWZZB-AA/DS-TZ89N-TA combinations.

Note

Ensure that there is no conflict with tape drive, system, and disk SCSI IDs.

8.3    Compaq 20/40 GB DLT Tape Drive

The Compaq 20/40 GB DLT Tape Drive is a Digital Linear Tape (DLT) tabletop cartridge tape drive that can hold up to 40 GB of data per CompacTape IV cartridge using 2:1 compression. It is capable of storing and retrieving data at a rate of up to 10.8 GB per hour (using 2:1 compression).

The Compaq 20/40 GB DLT Tape Drive uses CompacTape III, CompacTape IIIXT, or CompacTape IV media.

It is a narrow, single-ended SCSI device, and uses 50-pin, high-density connectors.

For more information on the Compaq 20/40 GB DLT Tape Drive, see the following Compaq documentation:

• Compaq DLT User Guide

• DLT Tape Drive User Guide Supplement

The following sections describe how to prepare the Compaq 20/40 GB DLT Tape Drive for shared SCSI bus usage in more detail.

8.3.1    Setting the Compaq 20/40 GB DLT Tape Drive SCSI ID

As with any of the shared SCSI devices, the Compaq 20/40 GB DLT Tape Drive SCSI ID must be set to ensure that no two SCSI devices on the shared SCSI bus have the same SCSI ID.

The Compaq 20/40 GB DLT Tape Drive SCSI ID is set with a push-button counter switch on the rear of the unit (see Figure 8-4). Push the button above the counter to increment the address; push the button below the counter to decrement the address until you have the desired SCSI ID selected.

Only SCSI IDs in the range of 0 through 7 are valid. Ensure that the tape drive SCSI ID does not conflict with the SCSI ID of the host bus adapters (usually 6 and 7) or other devices on this shared SCSI bus.

Figure 8-4:  Compaq 20/40 GB DLT Tape Drive Rear Panel

8.3.2    Cabling the Compaq 20/40 GB DLT Tape Drive

The Compaq 20/40 GB DLT Tape Drive is connected to a single-ended segment of the shared SCSI bus. A DWZZB-AA signal converter is required to convert the differential shared SCSI bus to single-ended. Figure 8-5 shows a configuration with a Compaq 20/40 GB DLT Tape Drive on a shared SCSI bus.

To configure the shared SCSI bus for use with a Compaq 20/40 GB DLT Tape Drive, follow these steps:

1. You will need one DWZZB-AA for each shared SCSI bus with a Compaq 20/40 GB DLT Tape Drive.

   Ensure that the DWZZB-AA jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Attach an H885-AA trilink connector or BN21W-0B Y cable to the differential end of the DWZZB-AA.

3. Connect the single-ended end of the DWZZB-AA to the Compaq 20/40 GB DLT Tape Drive with cable part number 199629-002 or 189636-002 (1.8-meter (5.9-foot) cables).

4. Install terminator part number 341102-001 on the other tape drive SCSI connector.

5. Connect the trilink on the DWZZB-AA to another trilink or Y cable on the differential shared SCSI bus with a 328215-00X, BN21K, or BN21L cable. Keep the length of the differential segment below the 25-meter (82-foot) maximum length (cable part number 328215-004 is a 20-meter (65.6-foot) cable). Ensure that the trilink or Y cable at both ends of the differential segment of the shared SCSI bus is terminated with an HD68 differential terminator such as an H879-AA.

The single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with cable part number 146745-003 or 146776-003 (0.9-meter (2.95-foot) cables) as long as the SCSI bus maximum length of 3 meters (9.8 feet) (fast SCSI) is not exceeded. Ensure that the tape drive on the end of the bus is terminated with terminator part number 341102-001.

You can add additional shared SCSI buses with Compaq 20/40 GB DLT Tape Drives by adding additional DWZZB-AA/Compaq 20/40 GB DLT Tape Drive combinations.

Notes

Ensure that there is no conflict with tape drive and host bus adapter SCSI IDs.

To achieve system performance capabilities, we recommend placing no more than two Compaq 20/40 GB DLT Tape Drives on a SCSI bus, and also recommend that no shared storage be placed on the same SCSI bus with the tape drive.

Figure 8-5:  Cabling a Shared SCSI Bus with a Compaq 20/40 GB DLT Tape Drive

Table 8-4 lists the components that are used to create the cluster that is shown in Figure 8-5.

Table 8-4:  Hardware Components Used to Create the Configuration Shown in Figure 8-5

8.4    Compaq 40/80-GB DLT Drive

The Compaq 40/80-DLT Drive is a Digital Linear Tape (DLT) table top cartridge tape drive that can hold up to 80 GB of data per DLT-IV cartridge using 2:1 compression. It can store and retrieve data at a rate of up to 43.2 GB per hour (using 2:1 compression).

The Compaq 40/80-DLT Drive uses DLT-III, DLT-IIIXT, or DLT-IV media.

This tape drive works with either a single-ended or low-voltage differential (LVD) host bus adapter using 68-pin high-density connectors. The single-ended voltages are either 0V or +5V. The low-voltage differential voltages range from -2.5V to +2.5V, a 5.0V differential. It will not work with high voltage differential (-5.0V to +5.0V) host bus adapters. Therefore, you cannot connect the KZPSA-BB or KZPBA-CB host bus adapters directly to the Compaq 40/80-DLT Drive. Instead, you must use a DWZZB-AA signal converter to convert the high voltage differential to single-ended SCSI.

For more information on the Compaq 40/80-DLT Drive, see the Compaq StorageWorks 40/80 DLT Drive Reference Guide.

The following sections describe how to prepare the Compaq 40/80-GB DLT Drive in more detail.

8.4.1    Setting the Compaq 40/80-GB DLT Drive SCSI ID

As with any of the shared SCSI devices, the Compaq 40/80-GB DLT Drive SCSI ID must be set to ensure that no two SCSI devices on the shared SCSI bus have the same SCSI ID.

You set the Compaq 40/80-GB DLT Drive SCSI ID with a pushbutton counter switch on the rear of the unit. Push the button above the counter to increment the address; push the button below the counter to decrement the address until you select the desired SCSI ID.

8.4.2    Cabling the Compaq 40/80-GB DLT Drive

The Compaq 40/80-GB DLT Drive is connected to a single-ended segment of the shared SCSI bus. Figure 8-6 shows a configuration with a Compaq 40/80-GB DLT Drive for use on a shared SCSI bus.

To configure the shared SCSI bus for use with a Compaq 40/80-GB DLT Drive, follow these steps:

1. You need one DWZZB-AA for each shared SCSI bus with a Compaq 40/80-GB DLT Drive.

   Ensure that the DWZZB-AA jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Connect an H885-AA trilink connector with attached H879-AA HD68 terminator to the differential end of the DWZZB-AA signal converter.

3. Connect a 328215-00X, BN21K, or BN21L cable between a Y cable or trilink connector on one of the system host bus adapters and the open connector on the trilink on the DWZZB-AA differential end. Keep the total length of the differential segment below the 25-meter (82-foot) maximum length. Ensure that the trilink or Y cable at both ends of the differential segment of the shared SCSI bus is terminated with an HD68 differential terminator such as an H879-AA.

4. Install a 152732-001 LVD terminator on one of the Compaq 40/80-GB DLT Drive SCSI connectors. The LVD terminator works with either a low voltage differential or a single-ended SCSI bus.

5. Connect one of the following HD68-to-HD68 cables between the other Compaq 40/80-GB DLT Drive SCSI connector and the single-ended end of the DWZZB-AA signal converter:

   • 189646-001 (0.9-meter; 2.95-foot) or 189646-002 (1.8-meter; 5.9-foot) cable

   • BN21K-01 or BN21L-01 (1-meter; 3.3-foot) cable

   • BN21K-02 or BN21L-02 (2-meter; 6.6-foot) cable

   This single-ended SCSI bus segment is limited to a maximum length of 3 meters (9.8 feet) (fast SCSI).

The single-ended SCSI bus may be daisy chained from one tape drive to another with one of the cables listed in step 5 as long as you do not exceed the single-ended SCSI bus maximum length of 3 meters (9.8 feet). The distance includes the length of both cables on the single-ended bus segment. Ensure that the tape drive on the end of the bus is terminated with an LVD terminator.

Ensure that SCSI IDs for the tape drive and host bus adapter do not conflict.

To achieve system performance capabilities, we recommend that you place no more than two Compaq 40/80-GB DLT Drives on a SCSI bus, and that you place no shared storage on the same SCSI bus with the tape drive.

Figure 8-6:  Cabling a Shared SCSI Bus with a Compaq 40/80-GB DLT Drive

Table 8-5 lists the components that are used to create the cluster that is shown in Figure 8-6.

Table 8-5:  Hardware Components in the Configuration in Figure 8-6

8.5    Preparing the TZ885 for Shared SCSI Usage

The TZ885 Digital Linear Tape subsystems combine a cartridge tape drive (TZ88) and an automatic cartridge loader. The TZ885 uses a removable magazine.

The TZ885 uses a five-cartridge (CompacTape IV) minitape library (magazine) with a 200-GB capacity (compressed). It is capable of reading/writing at approximately 10.8 GB per hour.

As with any of the shared SCSI devices, the TZ885 SCSI IDs must be set to ensure that no two SCSI devices on the shared SCSI bus have the same SCSI ID.

The following sections describe preparing the TZ885 in more detail.

8.5.1    Setting the TZ885 SCSI ID

To set the TZ885 SCSI ID from the Operators Control Panel (OCP), follow these steps:

1. Press and hold the Display Mode push button (for about 5 seconds) until the SCSI ID SEL message is displayed:

   SCSI ID SEL
   SCSI ID 0
   

2. Press the Select push button until you see the desired SCSI ID number in the display.

3. Press the Display Mode push button again.

4. Issue a bus reset or turn the minilibrary power off and on again to cause the drive to recognize the new SCSI ID.

8.5.2    Cabling the TZ885 Tape Drive

The TZ885 is connected to a single-ended segment of the shared SCSI bus. It is connected to a differential portion of the shared SCSI bus with a DWZZA-AA or DWZZB-AA. Figure 8-7 shows a configuration of a TZ885 for use on a shared SCSI bus. To configure the shared SCSI bus for use with a TZ885, follow these steps:

1. You will need one DWZZA-AA or DWZZB-AA for each TZ885 tape drive.

   Ensure that the DWZZA jumper J2 or DWZZB jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Attach a trilink connector to the differential end of the DWZZA or DWZZB.

3. Connect the single-ended end of a DWZZA to the TZ885 with a BC19J cable.

   Connect the single-ended end of a DWZZB to the TZ885 with a BN21M cable.

4. Install an H8574-A or H8890-AA terminator on the other TZ885 SCSI connector.

5. Connect a trilink or Y cable to the differential shared SCSI bus with BN21K or BN21L cables. Ensure that the trilink or Y cable at the end of the bus is terminated with an H879-AA terminator.

The single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with BC19J cables as long as the SCSI bus maximum length is not exceeded. Ensure that the tape drive on the end of the bus is terminated with a H8574-A or H8890-AA terminator.

You can add additional TZ885 tape drives to the differential shared SCSI bus by adding additional DWZZA or DWZZB/TZ885 combinations.

Note

Ensure that there is no conflict with tape drive and host bus adapter SCSI IDs.

Figure 8-7:  Cabling a Shared SCSI Bus with a TZ885

Table 8-6 lists the components that are used to create the cluster that is shown in Figure 8-7.

Table 8-6:  Hardware Components Used to Create the Configuration Shown in Figure 8-7

8.6    Preparing the TZ887 for Shared SCSI Bus Usage

The TZ887 Digital Linear Tape (DLT) MiniLibrary combines a cartridge tape drive (TZ88) and an automatic cartridge loader. It uses a seven-cartridge (CompacTape IV) removable magazine with a total capacity of nearly 280 GB compressed. It is capable of reading and writing at approximately 10.8 GB per hour.

As with any of the shared SCSI devices, the TZ887 SCSI IDs must be set to ensure that no two SCSI devices on the shared SCSI bus have the same SCSI ID.

The following sections describe how to prepare the TZ887 in more detail.

8.6.1    Setting the TZ887 SCSI ID

The TZ887 SCSI ID is set with a push-button counter switch on the rear of the unit (see Figure 8-8). Push the button above the counter to increment the address; push the button below the counter to decrement the address until you have the desired SCSI ID selected.

Figure 8-8:  TZ887 DLT MiniLibrary Rear Panel

8.6.2    Cabling the TZ887 Tape Drive

The TZ887 is connected to a single-ended segment of the shared SCSI bus. It is connected to a differential portion of the shared SCSI bus with a DWZZB-AA. Figure 8-9 shows a configuration with a TZ887 for use on a shared SCSI bus.

To configure the shared SCSI bus for use with a TZ887, follow these steps:

1. You will need one DWZZB-AA for each shared SCSI bus with a TZ887 tape drive.

   Ensure that the DWZZB-AA jumpers W1 and W2 are installed to enable the single-ended termination.

   Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2. Attach an H885-AA trilink connector to the differential end of the DWZZB-AA.

3. Connect the single-ended end of the DWZZB-AA to the TZ887 with a BN21M cable.

4. Install an H8574-A or H8890-AA terminator on the other TZ887 SCSI connector.

5. Connect the trilink on the DWZZB-AA to another trilink or Y cable on the differential shared SCSI bus with BN21K or BN21L cables. Ensure that the trilink or Y cable at both ends of the shared SCSI bus is terminated with an H879-AA terminator.

The single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with BC19J cables, as long as the SCSI bus maximum length is not exceeded and there are sufficient SCSI IDs available. Ensure that the tape drive on the end of the bus is terminated with an H8574-A or H8890-AA terminator.

You can add additional shared SCSI buses with TZ887 tape drives by adding additional DWZZB-AA/TZ887 combinations.

Note

Ensure that there is no conflict with tape drive and host bus adapter SCSI IDs.

Figure 8-9:  Cabling a Shared SCSI Bus with a TZ887

Table 8-6 lists the components that are used to create the cluster that is shown in Figure 8-9.

8.7    Preparing the TL891 and TL892 DLT MiniLibraries for Shared SCSI Usage

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 drives on a SCSI bus, and also recommend that no shared storage be placed on the same SCSI bus with a tape library.

The TL891 and TL892 MiniLibraries use one (TL891) or two (TL892) TZ89N-AV differential tape drives and a robotics controller, which access cartridges in a 10-cartridge magazine.

Each tape drive present, and the robotics controller, have individual SCSI IDs.

Six 68-pin, high-density SCSI connectors are located on the back of the MiniLibrary; two SCSI connectors for each drive and two for the robotics controller. The TL891 uses a 30-centimeter (11.8-inch) SCSI bus jumper cable (part of the TL891 package) to place the robotics controller and tape drive on the same SCSI bus. When upgrading to the TL892, you can place the second drive on the same SCSI bus (another 30-centimeter (11.8-inch) SCSI bus jumper cable is supplied with the DS-TL892-UA upgrade kit) or place it on its own SCSI bus.

The following sections describe how to prepare the TL891 and TL892 in more detail.

8.7.1    Setting the TL891 or TL892 SCSI ID

The control panel on the front of the TL891 and TL892 MiniLibraries is used to display power-on self-test (POST) status, display messages, and to set up MiniLibrary functions.

When power is first applied to a MiniLibrary, a series of POST diagnostics are performed. During POST execution, the MiniLibrary model number, current date and time, firmware revision, and the status of each test is displayed on the control panel.

After the POST diagnostics have completed, the default screen is shown:

DLT0 Idle
DLT1 Idle
Loader Idle
0> _ _ _ _ _ _ _ _ _ _ <9

The first and second lines of the default screen show the status of the two drives (if present). The third line shows the status of the library robotics, and the fourth line is a map of the magazine, with the numbers from 0 through 9 representing the cartridge slots. Rectangles on this line indicate cartridges that are present in the corresponding slot of the magazine.

For example, this fourth line ( 0> X X _ _ _ _ _ _ _ <9, where X represents rectangles) indicates that cartridges are installed in slots 0 and 1.

Note

There are no switches for setting a mechanical SCSI ID for the tape drives. The SCSI IDs default to 5. The MiniLibrary sets the electronic SCSI ID very quickly, before any device can probe the MiniLibrary, so the lack of a mechanical SCSI ID does not cause any problems on the SCSI bus.

To set the SCSI ID, follow these steps:

1. From the Default Screen, press the Enter button to enter the Menu Mode, displaying the Main Menu.

   Note

   When you enter the Menu Mode, the Ready light goes out, which indicates that the module is off line, and all media changer commands from the host return a SCSI not ready status until you exit the Menu Mode and the Ready light comes on again.

2. Press the down arrow button until the Configure Menu item is selected, then press the Enter button to display the Configure submenu.

   Note

   The control panel up and down arrows have an auto-repeat feature. When you press either button for more than one-half second, the control panel behaves as if you were pressing the button about four times per second. The effect stops when you release the button.

3. Press the down arrow button until the Set SCSI item is selected and press the Enter button.

4. Select the tape drive (DLT0 Bus ID: or DLT1 Bus ID:) or library robotics (LIB Bus ID:) whose SCSI bus ID you want to change. The default SCSI IDs are as follows:

   • Lib Bus ID: 0

   • DLT0 Bus ID: 4

   • DLT1 Bus ID: 5

   Use the up or down arrow button to select the item whose SCSI ID you want to change. Press the Enter button.

5. Use the up or down arrow button to scroll through the possible SCSI ID settings. Press the Enter button when the desired SCSI ID is displayed.

6. Repeat steps 4 and 5 to set other SCSI bus IDs as necessary.

7. Press the Escape button repeatedly until the default menu is displayed.

8.7.2    Cabling the TL891 or TL892 MiniLibraries

There are six 68-pin, high-density SCSI connectors on the back of the TL891. The two leftmost connectors are for the library robotics controller. The middle two are for tape drive 1. The two on the right are for tape drive 2 (if the TL892 upgrade has been installed).

Note

The tape drive SCSI connectors are labeled DLT1 (tape drive 1) and DLT2 (tape drive 2). The control panel designation for the drives is DLT0 (tape drive 1) and DLT1 (tape drive 2).

The default for the DLT MiniLibrary TL891 is to place the robotics controller and tape drive 1 on the same SCSI bus. A 30-centimeter (11.8-inch) SCSI jumper cable is provided with the unit. Plug this cable into the second connector (from the left) and the third connector. If the MiniLibrary has been upgraded to two drives, place the second drive on the same SCSI bus with another 30-centimeter (11.8-inch) SCSI bus jumper cable, or place it on its own SCSI bus.

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 tape drives on a SCSI bus.

The internal cabling of the TL891 and TL892 is too long to allow external termination with a trilink/H879-AA combination. Therefore, the TL891 or TL892 must be the last device on the shared SCSI bus. They may not be removed from the shared SCSI bus without stopping all ASE services that generate activity on the bus.

For this reason, we recommend that tape devices be placed on separate shared SCSI buses, and that there be no storage devices on the SCSI bus.

The cabling depends on whether or not there are one or two drives, and for the two-drive configuration, if each drive is on a separate SCSI bus.

Note

It is assumed that the library robotics controller is on the same SCSI bus as tape drive 1.

To connect the library robotics and one drive to a single shared SCSI bus, follow these steps:

1. Connect a BN21K or BN21L between the last trilink connector on the bus to the leftmost connector (as viewed from the rear) of the TL891.

2. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (second connector from the left) and the left DLT1 connector (the third connector from the left).

3. Install an H879-AA terminator on the right DLT1 connector (the fourth connector from the left).

To connect the drive robotics and two drives to a single shared SCSI bus, follow these steps:

1. Connect a BN21K or BN21L between the last trilink connector on the bus to the leftmost connector (as viewed from the rear) of the TL892.

2. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (the second connector from the left) and the left DLT1 connector (the third connector from the left).

3. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost DLT1 connector (the fourth connector from the left) and the left DLT2 connector (the fifth connector from the left).

4. Install an H879-AA terminator on the right DLT2 connector (the rightmost connector).

To connect the drive robotics and one drive to one shared SCSI bus and the second drive to a second shared SCSI bus, follow these steps:

1. Connect a BN21K or BN21L between the last trilink connector on one shared SCSI bus to the leftmost connector (as viewed from the rear) of the TL892.

2. Connect a BN21K or BN21L between the last trilink connector on the second shared SCSI bus to the left DLT2 connector (the fifth connector from the left).

3. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (the second connector from the left) and the left DLT1 connector (the third connector from the left).

4. Install an H879-AA terminator on the right DLT1 connector (the fourth connector from the left) and install another H879-AA terminator on the right DLT2 connector (the rightmost connector).

Figure 8-10 shows an example of a TruCluster Server cluster with a TL892 connected to two shared SCSI buses.

Figure 8-10:  TruCluster Server Cluster with a TL892 on Two Shared SCSI Buses

Table 8-7 lists the components that are used to create the cluster that is shown in Figure 8-10.

Table 8-7:  Hardware Components Used to Create the Configuration Shown in Figure 8-10

8.8    Preparing the TL890 DLT MiniLibrary Expansion Unit

The topics in this section provide information on preparing the TL890 DLT MiniLibrary expansion unit with the TL891 and TL892 DLT MiniLibraries for use on a shared SCSI bus.

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 drives on a SCSI bus, and also recommend that no shared storage be placed on the same SCSI bus with a tape library.

8.8.1    TL890 DLT MiniLibrary Expansion Unit Hardware

The TL890 expansion unit is installed above the TL891/TL892 DLT MiniLibrary base units in a SW500, SW800, or RETMA cabinet. The expansion unit integrates the robotics in the individual modules into a single, coordinated library robotics system. The TL890 assumes control of the media, maintaining an inventory of all media present in the system, and controls movement of all media. The tape cartridges can move freely between the expansion unit and any of the base modules via the system's robotically controlled pass-through mechanism. The pass-through mechanism is attached to the back of the expansion unit and each of the base modules.

For each TL891/TL892 base module beyond the first module, the pass-through mechanism must be extended by 17.78 centimeters (7 inches), which is the height of each module with a DS-TL800-AA pass-through mechanism extension. A 17.78-centimeter (7-inch) gap may be left between base modules (providing there is sufficient space), but additional pass-through mechanism extensions must be used.

For complete hardware installation instructions, see the DLT MiniLibrary (TL890) Expansion Unit User's Guide.

The combination of the TL890 expansion unit and the TL891/TL892 MiniLibrary modules is referred to as a DLT MiniLibrary for the remainder of this discussion.

8.8.2    Preparing the DLT MiniLibraries for Shared SCSI Bus Usage

The following sections describe how to prepare the DLT MiniLibraries in more detail. The descriptions are based on the assumption that the expansion unit, base modules, and pass-through and motor mechanisms have been installed.

8.8.2.1    Cabling the DLT MiniLibraries

You must make the following connections to render the DLT MiniLibrary system operational:

• Expansion unit to the motor mechanism: The motor mechanism cable is about 1 meter (3.3 feet) long and has a DB-15 connector on each end. Connect it between the connector labeled Motor on the expansion unit to the motor on the pass-through mechanism.

  Note

  This cable is not shown in Figure 8-11 because the pass-through mechanism is not shown in the figure.

• Robotics control cables from each base module to the expansion unit: These cables have a DB-9 male connector on one end and a DB-9 female connector on the other end. Connect the male end to the Expansion Unit Interface connector on the base module and the female end to any Expansion Modules connector on the expansion unit.

  Note

  It does not matter which interface connector a base module is connected to.

• SCSI bus connection to the expansion unit robotics: Connect the shared SCSI bus that will control the robotics to one of the SCSI connectors on the expansion unit with a BN21K (or BN21L) cable. Terminate the SCSI bus with an H879-AA terminator on the other expansion unit SCSI connector.

• SCSI bus connection to each of the base module tape drives: Connect a shared SCSI bus to one of the DLT1 or DLT2 SCSI connectors on each of the base modules with BN21K (or BN21L) cables. Terminate the other DLT1 or DLT2 SCSI bus connection with an H879-AA terminator.

  You can daisy chain between DLT1 and DLT2 (if present) with a 30-centimeter (11.8-inch) SCSI bus jumper (supplied with the TL891). Terminate the SCSI bus at the tape drive on the end of the shared SCSI bus with an H879-AA terminator.

  Notes

  Do not connect a SCSI bus to the SCSI connectors for the library connectors on the base modules.

  We recommend that no more than two TZ89 tape drives be on a SCSI bus.

Figure 8-11 shows a MiniLibrary configuration with two TL892 DLT MiniLibraries and a TL890 DLT MiniLibrary expansion unit. The TL890 library robotics is on one shared SCSI bus, and the two TZ89 tape drives in each TL892 are on separate, shared SCSI buses. The pass-through mechanism and cable to the library robotics motor are not shown in this figure.

Figure 8-11:  TL890 and TL892 DLT MiniLibraries on Shared SCSI Buses

Table 8-8 lists the components that are used to create the cluster that is shown in Figure 8-11.

Table 8-8:  Hardware Components Used to Create the Configuration Shown in Figure 8-11

8.8.2.2    Configuring a Base Module as a Slave

The TL891/TL892 base modules are shipped configured as standalone systems. When they are used in conjunction with the TL890 DLT MiniLibrary expansion unit, the expansion unit must control the robotics of each of the base modules. Therefore, the base modules must be configured as a slave to the expansion unit.

After the hardware and cables are installed, but before you power up the expansion unit in a MiniLibrary system for the first time, you must reconfigure each of the base modules in the system as a slave. The expansion unit will not have control over the base module robotics when you power up the MiniLibrary system if you do not reconfigure the base modules as a slave.

To reconfigure a TL891/TL892 base module as a slave to the TL890 DLT MiniLibrary expansion unit, perform the following procedure on each base module in the system:

1. Turn on the power switch on the TL891/TL892 base module to be reconfigured.

   Note

   Do not power on the expansion unit. Leave it powered off until all base modules have been reconfigured as slaves.

   After a series of power-on self-tests have executed, the default screen will be displayed on the base module control panel:

   DLT0 Idle
   DLT1 Idle
   Loader Idle
   0> _ _ _ _ _ _ _ _ _ _ <9
    
   

   The default screen shows the state of the tape drives, loader, and number of cartridges present for this base module. A rectangle in place of the underscore indicates that a cartridge is present in that location.

2. Press the Enter button to enter the Menu Mode, displaying the Main Menu.

3. Press the down arrow button until the Configure Menu item is selected, then press the Enter button.

   Note

   The control panel up and down arrows have an auto-repeat feature. When you press either button for more than half a second, the control panel behaves as if you were pressing the button about four times per second. The effect stops when you release the button.

4. Press the down arrow button until the Set Special Config menu is selected and press the Enter button.

5. Press the down arrow button repeatedly until the Alternate Config item is selected and press the Enter button.

6. Press the down arrow button to change the alternate configuration from the default (Standalone) to Slave. Press the Enter button.

7. After the selection stops flashing and the control panel indicates that the change is not effective until a reboot, press the Enter button.

8. When the Special Configuration menu reappears, turn the power switch off and then on to cycle the power. The base module is now reconfigured as a slave to the TL890 expansion unit.

9. Repeat the steps for each TL891/TL892 base module present that is to be a slave to the TL890 expansion unit.

8.8.2.3    Powering Up the DLT MiniLibrary

When turning on power to the DLT MiniLibrary, power must be applied to the TL890 expansion unit simultaneously or after power is applied to the the TL891/TL892 base modules. If the expansion unit is powered on first, its inventory of modules may be incorrect and the contents of some or all of the modules will be inaccessible to the system and to the host.

When the expansion unit comes up, it will communicate with each base module through the expansion unit interface and inventory the number of base modules, tape drives, and cartridges present in each base module. After the MiniLibrary configuration has been determined, the expansion unit will communicate with each base module and indicate to the base module which cartridge group that base module contains. The cartridges slots are numbered by the expansion unit as follows:

• Expansion unit: 0 through 15

• Top TL891/TL892: 16 through 25

• Middle TL891/TL892: 26 through 35

• Bottom TL891/TL892: 36 through 45

When all initialization communication between the expansion module and each base module has completed, the base modules will display their cartridge numbers according to the remapped cartridge inventory.

For instance, the middle base module default screen would be displayed as follows:

DLT2 Idle
DLT3 Idle
Loader Idle
26> _ _ _ _ _ _ _ _ _ _ <35
 

8.8.2.4    Setting the TL890/TL891/TL892 SCSI ID

After the base modules have been reconfigured as slaves, each base module control panel still provides tape drive status and error information, but all control functions are carried out from the expansion unit control panel. This includes setting the SCSI ID for each of the tape drives present.

To set the SCSI IDs for the tape drives in a MiniLibrary configured with TL890/TL891/TL892 hardware, follow these steps:

1. Apply power to the MiniLibrary, ensuring that you power up the expansion unit after or at the same time as the base modules.

2. Wait until power-on self-tests (POST) have terminated and the expansion unit and each base module display the default screen.

3. At the expansion unit control panel, press the Enter button to display the Main Menu.

4. Press the down arrow button until the Configure Menu item is selected, and then press the Enter button to display the Configure submenu.

5. Press the down arrow button until the Set SCSI item is selected and press the Enter button.

6. Press the up or down arrow button to select the appropriate tape drive (DLT0 Bus ID:, DLT1 Bus ID:, DLT2 Bus ID:, and so on) or library robotics (Library Bus ID:) for which you want to change the SCSI bus ID. Assuming that each base module has two tape drives, the top base module contains DLT0 and DLT1. The next base module down contains DLT2 and DLT3. The bottom base module contains DLT4 and DLT5. The default SCSI IDs, after being reconfigured by the expansion unit, are as follows:

   • Library Bus ID: 0

   • DLT0 Bus ID: 1

   • DLT1 Bus ID: 2

   • DLT2 Bus ID: 3

   • DLT3 Bus ID: 4

   • DLT4 Bus ID: 5

   • DLT5 Bus ID: 6

7. Press Enter when you have the item selected for which you want to change the SCSI ID.

8. Use the up and down arrows to select the desired SCSI ID. Press the Enter button to save the new selection.

9. Press the Escape button once to return to the Set SCSI submenu to select another tape drive or the library robotics, and then repeat steps 6, 7, and 8 to set the SCSI ID.

10. If there are other items that you want to configure, press the Escape button until the Configure submenu is displayed, then select the item to be configured. Repeat this procedure for each item that you want to configure.

11. If there are no more items to be configured, press the Escape button until the Default window is displayed.

8.9    Preparing the TL894 DLT Automated Tape Library for Shared SCSI Bus Usage

The topics in this section provide information on preparing the TL894 DLT automated tape library for use on a shared SCSI bus in a TruCluster Server cluster.

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 drives on a SCSI bus segment. We also recommend that storage be placed on shared SCSI buses that do not have tape drives.

The TL894 midrange automated DLT library contains a robotics controller and four differential TZ89 tape drives.

The following sections describe how to prepare the TL894 in more detail.

8.9.1    TL894 Robotic Controller Required Firmware

Robotic firmware Version S2.20 is the minimum firmware revision that is supported in a TruCluster Server cluster. For information on upgrading the robotic firmware, see the Flash Download section of the TL81X/TL894 Automated Tape Library for DLT Cartridges Diagnostic Software User's Manual.

8.9.2    Setting TL894 Robotics Controller and Tape Drive SCSI IDs

The robotics controller, and each tape drive must have the SCSI ID set (unless the default is sufficient). Table 8-9 lists the default SCSI IDs.

Table 8-9:  TL894 Default SCSI ID Settings

To set the SCSI ID for the TL894 robotics controller, follow these steps:

1. Press and release the Control Panel STANDBY button and verify that the SDA (Status Display Area) shows System Off-line.

2. Press and release SELECT to enter the menu mode.

3. Verify that the following information is displayed in the SDA:

   Menu:
   Configuration:
   

4. Press and release SELECT to choose the Configuration menu.

5. Verify that the following information is displayed in the SDA:

   Menu:  Configuration
   Inquiry
   

6. Press and release the up or down arrow buttons to locate the SCSI Address submenu, and verify that the following information is displayed in the SDA:

   Menu: Configuration
   SCSI Address ..
   

7. Press and release the SELECT button to choose the SCSI Address submenu and verify that the following information is displayed in the SDA:

   Menu:  Configuration
   Robotics
   

8. Press and release the SELECT button to choose the Robotics submenu and verify that the following information is displayed in the SDA:

   Menu:  SCSI Address
   SCSI ID 0
   

9. Use the up and down arrow buttons to select the desired SCSI ID for the robotics controller.

10. When the desired SCSI ID is displayed on line 2, press and release the SELECT button.

11. Press and release the up or down button to clear the resulting display from the command.

12. Press and release the up or down button and the SELECT button simultaneously, and verify that System On-line or System Off-line is displayed in the SDA.

To set the SCSI ID for each tape drive if the desired SCSI IDs are different from those shown in Table 8-9, follow these steps:

1. Press and release the Control Panel STANDBY button and verify that the SDA (Status Display Area) shows System Off-line.

2. Press and release SELECT to enter the menu mode.

3. Verify that the following information is displayed in the SDA:

   Menu:
   Configuration:
   

4. Press and release SELECT to choose the Configuration menu.

5. Verify that the following information is displayed in the SDA:

   Menu:  Configuration
   SCSI Address
   

6. Press and release the SELECT button again to choose SCSI Address and verify that the following information is shown in the SDA:

   Menu:  SCSI Address
   Robotics
   

7. Use the down arrow button to bypass the Robotics submenu and verify that the following information is shown in the SDA:

   Menu:  SCSI Address
   Drive 0
   

8. Use the up and down arrow buttons to select the drive number to set or change.

9. When you have the proper drive number displayed on line 2, press and release the SELECT button and verify that the following information is shown in the SDA:

   Menu:  Drive 0
   SCSI ID 0
   

10. Use the up and down arrow buttons to select the desired SCSI ID for the selected drive.

11. When the desired SCSI ID is displayed on line 2, press and release the SELECT button.

12. Repeat steps 8 through 11 to set or change all other tape drive SCSI IDs.

13. Press and release the up or down button to clear the resulting display from the command.

14. Press and release the up or down button and the SELECT button simultaneously and verify that System On-line or System Off-line is displayed in the SDA.

8.9.3    TL894 Tape Library Internal Cabling

The default internal cabling configuration for the TL894 tape library has the robotics controller and top drive (drive 0) on SCSI bus port 1. Drive 1 is on SCSI bus port 2, drive 2 is on SCSI port 3, and drive 3 is on SCSI bus port 4. A terminator (part number 0415619) is connected to each of the drives to provide termination at that end of the SCSI bus.

This configuration, which is called the four-bus configuration, is shown in Figure 8-12. In this configuration, each of the tape drives, except SCSI bus drive 0 and the robotics controller, requires a SCSI address on a separate SCSI bus. The robotics controller and drive 0 use two SCSI IDs on their SCSI bus.

Figure 8-12:  TL894 Tape Library Four-Bus Configuration

You can reconfigure the tape drives and robotics controller in a two-bus configuration by using the SCSI jumper cable (part number 6210567) that is supplied in the accessories kit that is shipped with each TL894 unit. Remove the terminator from one drive and remove the internal SCSI cable from the other drive to be daisy chained. Use the SCSI jumper cable to connect the two drives and place them on the same SCSI bus.

Notes

We recommend that you not place more than two TZ89 tape drives on any one SCSI bus in these tape libraries. We also recommend that storage be placed on shared SCSI buses that do not have tape drives.

Therefore, we recommend that you not reconfigure the TL894 tape library into the one-bus configuration.

Appendix B of the TL81X/TL894 Automated Tape Library for DLT Cartridges Facilities Planning and Installation Guide provides figures showing various bus configurations. In these figures, the configuration changes have been made by removing the terminators from both drives, installing the SCSI bus jumper cable on the drive connectors vacated by the terminators, then installing an HD68 SCSI bus terminator on the SCSI bus port connector on the cabinet exterior.

Doing this is not wrong, but by reconfiguring in this manner, the length of the SCSI bus is increased by 1.5 meters (4.9 feet), and may cause problems if SCSI bus length is of concern.

8.9.4    Connecting the TL894 Tape Library to the Shared SCSI Bus

The TL894 tape libraries have up to 3 meters (9.8 feet) of internal SCSI cabling per SCSI bus. Because of the internal SCSI cable lengths, you cannot use a trilink connector or Y cable to terminate the SCSI bus external to the library as is done with other devices on the shared SCSI bus. Each SCSI bus must be terminated internal to the tape library, at the tape drive itself with the installed SCSI terminators. Therefore, TruCluster Server clusters using the TL894 tape library must ensure that the tape library is on the end of the shared SCSI bus.

In a TruCluster Server cluster with a TL894 tape library, the member systems and StorageWorks enclosures or RAID subsystems may be isolated from the shared SCSI bus because they use trilink connectors or Y cables. However, the ASE must be shut down to remove a tape loader from the shared bus.

Figure 8-13 shows a sample TruCluster Server cluster using a TL894 tape library. In the sample configuration, the tape library has been connected in the two-bus mode by jumpering tape drive 0 to tape drive 1 and tape drive 2 to tape drive 3 (see Section 8.9.3 and Figure 8-12). The two SCSI buses are left at the default SCSI IDs and terminated at drives 1 and 3 with the installed terminators (part number 0415619).

To add a TL894 to a shared SCSI bus, select the member system or storage device that will be the next to last device on the shared SCSI bus. Connect a BN21K or BN21L cable between the Y cable on that device to the appropriate tape library port.

In Figure 8-13, one bus is connected to port 1 (robotics controller and tape drives 0 and 1) and the other bus is connected to port 3 (tape drives 2 and 3). Ensure that the terminators are present on the tape drives 1 and 3.

Figure 8-13:  Shared SCSI Buses with TL894 in Two-Bus Mode

Table 8-10 lists the components that are used to create the cluster that is shown in Figure 8-13.

Table 8-10:  Hardware Components Used to Create the Configuration Shown in Figure 8-13

8.10    Preparing the TL895 DLT Automated Tape Library for Shared SCSI Bus Usage

The topics in this section provide information on preparing the TL895 Digital Linear Tape (DLT) automated tape library for use on a shared SCSI bus.

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 drives on a SCSI bus segment. We also recommend that storage be placed on shared SCSI buses that do not have tape drives. This makes it easier to stop ASE services affecting the SCSI bus that the tape loaders are on.

The DS-TL895-BA automated digital linear tape library consists of five TZ89N-AV tape drives and 100 tape cartridge bins (96 storage bins in a fixed-storage array (FSA) and 4 load port bins). The storage bins hold CompacTape III, CompacTape IIIXT, or CompacTape IV cartridges. The maximum storage capacity of the library is 3500 GB uncompressed, based upon 100 CompacTape IV cartridges at 35 GB each. For more information on the TL895, see the following manuals:

• TL895 DLT Tape Library Facilities Planning and Installation Guide

• TL895 DLT Library Operator's Guide

• TL895 DLT Tape Library Diagnostic Software User's Manual

For more information on upgrading from five to six or seven tape drives, see the TL895 Drive Upgrade Instructions manual.

Note

Rotary switches on the library printed circuit board are used to set the library and tape drive SCSI IDs. The SCSI IDs set by these switches are used for the first 20 to 30 seconds after power is applied, until the electronics is activated and able to set the SCSI IDs electronically.

The physical SCSI IDs should match the SCSI IDs set by the library electronics. Ensure that the SCSI IDs that are set by the rotary switch and from the control panel do not conflict with any SCSI bus controller SCSI ID.

The following sections describe how to prepare the TL895 for use on a shared SCSI bus in more detail.

8.10.1    TL895 Robotic Controller Required Firmware

Robotic firmware version N2.20 is the minimum firmware revision supported in a TruCluster Server cluster. For information on upgrading the robotic firmware, see the Flash Download section of the TL895 DLT Tape Library Diagnostic Software User's Manual.

8.10.2    Setting the TL895 Tape Library SCSI IDs

The library and each tape drive must have the SCSI ID set (unless the default is sufficient). Table 8-11 lists the TL895 default SCSI IDs.

Table 8-11:  TL895 Default SCSI ID Settings

The SCSI IDs must be set mechanically by the rotary switches, and electronically from the control panel. After you have set the SCSI IDs from the switches, power up the library and electronically set the SCSI IDs.

To electronically set the SCSI ID for the TL895 library and tape drives, follow these steps:

1. At the control panel, press the Operator tab.

2. On the Enter Password screen, enter the operator password. The default operator password is 1234. The lock icon is unlocked and shows an O to indicate that you have operator-level security clearance.

3. On the Operator screen, press the Configure Library button. The Configure Library screen displays the current library configuration.

   Note

   You can configure the library model number, number of storage bins, number of drives, library SCSI ID, and tape drive SCSI IDs from the Configure Library screen.

4. To change any of the configurations, press the Configure button.

5. Press the Select button until the item that you want to configure is highlighted. For the devices, select the desired device (library or drive) by scrolling through the devices with the arrow buttons. After the library or selected drive is selected, use the Select button to highlight the SCSI ID.

6. Use the arrow buttons to scroll through the setting choices until the desired setting appears.

7. When you have the desired setting, press the Change button to save the setting as part of the library configuration.

8. Repeat steps 5 through 7 to make additional changes to the library configuration.

9. Place the library back at the user level of security as follows:

   1. Press the lock icon on the vertical bar of the control panel.

   2. On the Password screen, press the User button.

      A screen appears informing you that the new security level has been set.

   3. Press the OK button. The lock icon appears as a locked lock and displays a U to indicate that the control panel is back at User level.

10. Power cycle the tape library to allow the new SCSI IDs to take effect.

8.10.3    TL895 Tape Library Internal Cabling

The default internal cabling configuration for the TL895 tape library has the library robotics controller and top drive (drive 0) on SCSI bus port 1. Drive 1 is on SCSI bus port 2, drive 2 is on SCSI bus port 3, and so on. A terminator (part number 0415619) is connected to each of the drives to provide termination at the tape drive end of the SCSI bus.

In this configuration each of the tape drives, except tape drive 0 and the robotics controller, require a SCSI ID on a separate SCSI bus. The robotics controller and tape drive drive 0 use two SCSI IDs on their SCSI bus.

You can reconfigure the tape drives and robotics controller to place multiple tape drives on the same SCSI bus with SCSI bus jumper (part number 6210567) included with the tape library.

Note

We recommend placing no more than two TZ89 drives on a SCSI bus segment. We also recommend that storage be placed on shared SCSI buses that do not have tape drives.

To reconfigure TL895 SCSI bus configuration, follow these steps:

1. Remove the SCSI bus cable from one drive to be daisy chained.

2. Remove the terminator from the other drive to be daisy chained.

3. Ensure that the drive that will be the last drive on the SCSI bus has a terminator installed.

4. Install a SCSI bus jumper cable (part number 6210567) on the open connectors of the two drives to be daisy chained.

Figure 8-14 shows an example of a TL895 that has tape drives 1, 3, and 5 daisy chained to tape drives 2, 4, and 6 respectively.

Figure 8-14:  TL895 Tape Library Internal Cabling

8.10.4    Upgrading a TL895

The TL985 DLT automated tape library can be upgraded from two or five tape drives to seven drives with multiple DS-TL89X-UA upgrade kits. Besides the associated documentation, the upgrade kit contains one TZ89N-AV tape drive, a SCSI bus terminator, a SCSI bus jumper (part number 6210567) so you can place more than one drive on the same SCSI bus, and other associated hardware.

Before the drive is physically installed, set the SCSI ID rotary switches (on the library printed circuit board) to the same SCSI ID that will be electronically set. After the drive installation is complete, set the electronic SCSI ID using the Configure menu from the control panel (see Section 8.10.2).

The actual upgrade is beyond the scope of this manual. See the TL895 Drive Upgrade Instructions manual for upgrade instructions.

8.10.5    Connecting the TL895 Tape Library to the Shared SCSI Bus

The TL895 tape library has up to 3 meters (9.8 feet) of internal SCSI cabling per SCSI bus. Because of the internal SCSI cable lengths, you cannot use a trilink connector or Y cable to terminate the SCSI bus external to the library as is done with other devices on the shared SCSI bus. Each SCSI bus must be terminated internal to the tape library at the tape drive itself with the installed SCSI terminators. Therefore, TruCluster Server clusters using the TL895 tape libraries must ensure that the tape libraries are on the end of the shared SCSI bus.

In a TruCluster Server cluster with a TL895 tape library, the member systems and StorageWorks enclosures or RAID subsystems may be isolated from the shared SCSI bus because they use trilink connectors or Y cables. However, because the TL895 cannot be removed from the shared SCSI bus, all ASE services that use any shared SCSI bus attached to the TL895 must be stopped before the tape loader can be removed from the shared bus.

To add a TL895 tape library to a shared SCSI bus, select the member system or storage device that will be the next to last device on the shared SCSI bus. Connect a BN21K or BN21L cable between a trilink or Y cable on that device to the appropriate tape library port.

8.11    Preparing the TL893 and TL896 Automated Tape Libraries for Shared SCSI Bus Usage

The topics in this section provide information on preparing the TL893 and TL896 Automated Tape Libraries (ATLs) for use on a shared SCSI in a TruCluster Server cluster.

Note

To achieve system performance capabilities, we recommend placing no more than two TZ89 drives on a SCSI bus.

The TL893 and TL896 Automated Tape Libraries (ATLs) are designed to provide high-capacity storage and robotic access for the Digital Linear Tape (DLT) series of tape drives. They are identical except in the number of tape drives and the maximum capacity for tape cartridges.

Each tape library comes configured with a robotic controller and bar code reader (to obtain quick and accurate tape inventories).

The libraries have either three or six TZ89N-AV drives. The TL896, because it has a greater number of drives, has a lower capacity for tape cartridge storage.

Each tape library utilizes bulk loading of bin packs, with each bin pack containing a maximum of 11 cartridges. Bin packs are arranged on an eight-sided carousel that provides either two or three bin packs per face. A library with three drives has a carousel three bin packs high. A library with six drives has a carousel that is only two bin packs high. This provides for a total capacity of 24 bin packs (264 cartridges) for the TL893, and 16 bin packs (176 cartridges) for the TL896.

The tape library specifications are as follows:

• TL893 -- The TL893 ATL is a high-capacity, 264-cartridge tape library providing up to 18.4 TB of storage. The TL893 uses three fast-wide, differential TZ89N-AV DLT tape drives. It has a maximum transfer rate of almost 10 MB per second (compressed) for each drive, or a total of about 30 MB per second.

  The TL893 comes configured for three SCSI-2 buses (a three-bus configuration). The SCSI bus connector is high-density 68-pin, differential.

• TL896 -- The TL896 ATL is a high-capacity, 176-cartridge tape library providing up to 12.3 TB of storage. The TL896 uses six fast-wide, differential TZ89N-AV DLT tape drives. It also has a maximum transfer rate of almost 10 MB per second per drive (compressed), or a total of about 60 MB per second.

  The TL896 comes configured for six SCSI-2 buses (a six-bus configuration). The SCSI bus connector is also high-density 68-pin, differential.

Both the TL893 and TL896 can be extended by adding additional cabinets (DS-TL893-AC for the TL893 or DS-TL896-AC for the TL896). See the TL82X Cabinet-to-Cabinet Mounting Instructions manual for information on adding additional cabinets. Up to five cabinets are supported with the TruCluster Server.

For TruCluster Server, the tape cartridges in all the cabinets are combined into one logical unit, with consecutive numbering from the first cabinet to the last cabinet, by an upgrade from the multi-unit, multi-LUN (MUML) configuration to a multi-unit, single-LUN (MUSL) configuration. See the TL82X/TL89X MUML to MUSL Upgrade Instructions manual for information on the firmware upgrade.

These tape libraries each have a multi-unit controller (MUC) that serves two functions:

• It is a SCSI adapter that allows the SCSI interface to control communications between the host and the tape library.

• It permits the host to control up to five attached library units in a multi-unit configuration. Multi-unit configurations are not discussed in this manual. For more information on multi-unit configurations, see the TL82X/TL893/TL896 Automated Tape Library for DLT Cartridges Facilities Planning and Installation Guide.

The following sections describe how to prepare these tape libraries in more detail.

8.11.1    Communications with the Host Computer

Two types of communications are possible between the tape library and the host computer: SCSI and EIA/TIA-574 serial (RS-232 for nine-pin connectors). Either method, when used with the multi-unit controller (MUC), allows a single host computer to control up to five units.

A TruCluster Server cluster supports SCSI communications only between the host computer and the MUC. With SCSI communications, both control signals and data flow between the host computer and tape library use the same SCSI cable. The SCSI cable is part of the shared SCSI bus.

An RS-232 loopback cable must be connected between the Unit 0 and Input nine-pin connectors on the rear connector panel. The loopback cable connects the MUC to the robotic controller electronics.

Switch 7 on the MUC switch pack must be down to select the SCSI bus.

8.11.2    MUC Switch Functions

Switch pack 1 on the rear of the multi-unit controller (MUC) is located below the MUC SCSI connectors. The switches provide the functions shown in Table 8-12.

Table 8-12:  MUC Switch Functions

8.11.3    Setting the MUC SCSI ID

The multi-unit controller (MUC) SCSI ID is set with switch 1, 2, and 3, as shown in Table 8-13. Note that switch 7 must be down to select the SCSI bus and enable switches 1, 2, and 3 to select the MUC SCSI ID.

Table 8-13:  MUC SCSI ID Selection

8.11.4    Tape Drive SCSI IDs

Each tape library arrives with default SCSI ID selections. The TL893 is shown in Table 8-14. The TL896 is shown in Table 8-15.

If you must modify the tape drive SCSI IDs, use the push-button up-down counters on the rear of the drive to change the SCSI ID.

Table 8-14:  TL893 Default SCSI IDs

Table 8-15:  TL896 Default SCSI IDs

8.11.5    TL893 and TL896 Automated Tape Library Internal Cabling

The default internal cabling configurations for the TL893 and TL896 Automated Tape Libraries (ATLs) are as follows:

• The SCSI input for the TL893 is high-density, 68-pin differential. The default internal cabling configuration for the TL893 is a three-bus mode shown in Figure 8-15 as follows:

  • The top shelf tape drive (SCSI ID 5) and MUC (SCSI ID 2) are on SCSI Port C and are terminated on the MUC. To allow the use of the same MUC and terminator used with the TL822 and TL826, a 68-pin to 50-pin adapter is used on the MUC to connect the SCSI cable from the tape drive to the MUC. In Figure 8-15 it is shown as part number 0425031, the SCSI Diff Feed Through. This SCSI bus is terminated on the MUC with terminator part number 0415498, a 50-pin Micro-D terminator.

  • The middle shelf tape drive (SCSI ID 4) is on SCSI Port B and is terminated on the drive with a 68-pin Micro-D terminator, part number 0415619.

  • The bottom shelf tape drive (SCSI ID 3) is on SCSI Port A and is also terminated on the drive with a 68-pin Micro-D terminator, part number 0415619.

  Figure 8-15:  TL893 Three-Bus Configuration

  

• The SCSI input for the TL896 is also high-density, 68-pin differential. The default internal cabling configuration for the TL896 is a six-bus configuration shown in Figure 8-16 as follows:

  • The upper bay top shelf tape drive (tape drive 5, SCSI ID 5) and MUC (SCSI ID 2) are on SCSI Port D. To allow the use of the same MUC and terminator used with the TL822 and TL826, a 68-pin to 50-pin adapter is used on the MUC to connect the SCSI cable from the tape drive to the MUC. In Figure 8-16 it is shown as part number 0425031, SCSI Diff Feed Through. This SCSI bus is terminated on the MUC with terminator part number 0415498, a 50-pin Micro-D terminator.

  • The upper bay middle shelf tape drive (tape drive 4, SCSI ID 4) is on SCSI Port E and is terminated on the tape drive.

  • The upper bay bottom shelf tape drive (tape drive 3, SCSI ID 3) is on SCSI Port F and is terminated on the tape drive.

  • The lower bay top shelf tape drive (tape drive 2, SCSI ID 5) is on SCSI Port A and is terminated on the tape drive.

  • The lower bay middle shelf tape drive (tape drive 1, SCSI ID 4) is on SCSI Port B and is terminated on the tape drive.

  • The lower bay bottom shelf tape drive (tape drive 0, SCSI ID 3) is on SCSI Port C and is terminated on the tape drive.

  • The tape drive terminators are 68-pin differential terminators (part number 0415619).

  Figure 8-16:  TL896 Six-Bus Configuration

  

8.11.6    Connecting the TL893 and TL896 Automated Tape Libraries to the Shared SCSI Bus

The TL893 and TL896 Automated Tape Libraries (ATLs) have up to 3 meters (9.8 feet) of internal SCSI cabling on each SCSI bus. Because of the internal SCSI cable lengths, you cannot use a trilink connector or Y cable to terminate the SCSI bus external to the library as is done with other devices on the shared SCSI bus. Each SCSI bus must be terminated internal to the tape library at the tape drive itself with the installed SCSI terminators. Therefore, TL893 and TL896 tape libraries must be on the end of the shared SCSI bus.

In a TruCluster Server cluster with TL893 or TL896 tape libraries, the member systems and StorageWorks enclosures or RAID subsystems may be isolated from the shared SCSI bus because they use trilink connectors or Y cables. However, if there is disk storage and an ATL on the same shared SCSI bus, the ASE must be shut down to remove a tape library from the shared bus.

You can reconfigure the tape drives and robotics controller to generate other bus configurations by using the jumper cable (ATL part number 0425017) supplied in the accessories kit shipped with each TL893 or TL896 unit.

Remove the terminator from one drive and remove the internal SCSI cable from the other drive to be daisy chained. Use the jumper cable to connect the two drives and place them on the same SCSI bus.

Note

We recommend that you place not more than two drives on any one SCSI bus in these tape libraries.

Figure 8-17 shows a sample TruCluster Server cluster using a TL896 tape library in a three-bus configuration. In this configuration, tape drive 4 (Port E) has been jumpered to tape drive 5, tape drive 2 (Port A) has been jumpered to tape drive 3, and tape drive 1 (Port B) has been jumpered to tape drive 0.

To add a TL893 or TL896 tape library to a shared SCSI bus, select the member system that will be the next to the last device on the shared SCSI bus (the tape library always has to be the last device on the shared SCSI bus). Connect a BN21K, BN21L, or BN31G cable between the Y cable on the SCSI bus controller on that member system and the appropriate tape library port. In Figure 8-17, one shared SCSI bus is connected to port B (tape drives 0 and 1), one shared SCSI bus is connected to port A (tape drives 2 and 3), and a third shared SCSI bus is connected to port E (tape drives 4 and 5 and the MUC).

Figure 8-17:  Shared SCSI Buses with TL896 in Three-Bus Mode

Table 8-16 lists the components that are used to create the cluster that is shown in Figure 8-17.

Table 8-16:  Hardware Components Used to Create the Configuration Shown in Figure 8-17

8.12    Preparing the TL881 and TL891 DLT MiniLibraries for Shared Bus Usage

The topics in this section provide an overview of the Compaq StorageWorks TL881 and TL891 Digital Linear Tape (DLT) MiniLibraries and hardware configuration information for preparing the TL881 or TL891 DLT MiniLibrary for use on a shared SCSI bus.

8.12.1    TL881 and TL891 DLT MiniLibraries Overview

For more information on the TL881 or TL891 DLT MiniLibraries, see the following Compaq documentation:

• TL881 MiniLibrary System User's Guide

• TL891 MiniLibrary System User's Guide

• TL881 MiniLibrary Drive Upgrade Procedure

• Pass-Through Expansion Kit Installation Instructions

The TL881 and TL891 Digital Linear Tape (DLT) MiniLibraries are offered as standalone tabletop units or as expandable rackmount units.

The following sections describe these units in more detail.

8.12.1.1    TL881 and TL891 DLT MiniLibrary Tabletop Model

The TL881 and TL891 DLT MiniLibrary tabletop model consists of one unit with a removable 10-cartridge magazine, integral bar code reader, and either one or two DLT 20/40 (TL881) or DLT 35/70 (TL891) drives.

The TL881 DLT MiniLibrary tabletop model is available as either fast, wide differential or fast, wide single-ended. The single-ended model is not supported in a TruCluster Server configuration.

The TL891 DLT MiniLibrary tabletop model is only available as fast, wide differential.

8.12.1.2    TL881 and TL891 MiniLibrary Rackmount Components

A TL881 or TL891 base unit (which contains the tape drive) can operate as an independent, standalone unit, or in concert with an expansion unit and multiple data units.

A rackmount multiple-module configuration is expandable to up to six modules in a configuration. The configuration must contain at least one expansion unit and one base unit. The TL881 and TL891 DLT MiniLibraries may include various combinations of:

• MiniLibrary Expansion unit -- the MiniLibrary expansion unit enables multiple TL881 or TL891 modules to share data cartridges and work as a single virtual library. The expansion unit also includes a 16-cartridge magazine.

  The expansion unit integrates the robotics in the individual modules into a single coordinated library robotics system. The expansion unit assumes control of the media, maintaining an inventory of all media present in the system, and controls movement of all media. The tape cartridges can move freely between the expansion unit and any of the base units or data units via the system's robotically controlled pass-through mechanism.

  The expansion unit can control up to five additional attached modules (base units and data units) to create a multimodule rackmount configuration. The expansion unit must be enabled to control the base unit by setting the base unit to slave mode. The data unit is a passive device and only works as a slave to the expansion unit. To create a multimodule rackmount system, there must be one expansion unit and at least one base unit. The expansion unit has to be the top module in the configuration.

  The expansion unit works with either the TL881 or TL891 base unit.

• TL881 or TL891 base unit -- includes library robotics, bar code reader, a removable 10-cartridge magazine, and one or two tape drives:

  • TL881 -- DLT 20/40 (TZ88N-AV) drives

  • TL891 -- DLT 35/70 (TZ89N-AV) drives

  To participate in a MiniLibrary configuration, each base unit must be set up as a slave unit to pass control to the expansion unit. When the expansion unit has control over the base unit, the expansion unit controls tape-cartridge movement between the magazines and tape drives.

  Note

  You cannot mix TL881 and TL891 base units in a rackmount configuration because the tape drives use different formats.

• Data unit -- This rackmount module contains a 16-cartridge magazine to provide additional capacity in a multi-module configuration. The data unit robotics works in conjunction with the robotics of the expansion unit and base units. It is under control of the expansion unit.

  The data unit works with either the TL881 or TL891 base unit.

• Pass through mechanism -- The pass-through mechanism is attached to the back of the expansion unit and each of the other modules and allows the transfer of tape cartridges between the various modules. It is controlled by the expansion unit.

  For each base or data unit added to a configuration, the pass-through mechanism must be extended by 17.8 centimeters (7 inches), which is the height of each module. A 17.8-centimeter (7-inch) gap may be left between modules (providing there is sufficient space), but additional pass-through mechanism extensions must be used.

8.12.1.3    TL881 and TL891 Rackmount Scalability

The rackmount version of the TL881 and TL891 MiniLibraries provides a scalable tape library system that you can configure for maximum performance, maximum capacity, or various combinations between the extremes.

Either library uses DLT IV tape cartridges but can also use DLT III or DLT IIIxt tape cartridges. Table 8-17 lists the capacity and performance of a TL881 or TL891 MiniLibrary in configurations that are set up for either maximum performance or maximum capacity.

Table 8-17:  TL881 and TL891 MiniLibrary Performance and Capacity Comparison

By modifying the combinations of base units and data units, the performance and total capacity can be adjusted to meet the customers' needs.

8.12.1.4    DLT MiniLibrary Part Numbers

Table 8-18 lists the part numbers for the TL881 and TL891 DLT MiniLibrary systems. Part numbers are only shown for the TL881 fast, wide differential components.

Table 8-18:  DLT MiniLibrary Part Numbers

Note

The TL881 DLT MiniLibrary tabletop model is available as fast, wide differential or fast, wide single-ended. The single-ended model is not supported in a cluster configuration. The TL891 DLT MiniLibrary tabletop model is only available as fast, wide differential.

8.12.2    Preparing a TL881 or TL891 MiniLibrary for Shared SCSI Bus Use

The following sections describe how to prepare the TL881 and TL891 DLT MiniLibraries for shared SCSI bus use in more detail.

8.12.2.1    Preparing a Tabletop Model or Base Unit for Standalone Shared SCSI Bus Usage

A TL881 or TL891 DLT MiniLibrary tabletop model or a rackmount base unit may be used standalone. You may want to purchase a rackmount base unit for future expansion.

Note

To achieve system performance capabilities, we recommend placing no more than two tape drives on a SCSI bus, and also recommend that no shared storage be placed on the same SCSI bus with a tape library.

The topics in this section provide information on preparing the TL881 or TL891 DLT MiniLibrary tabletop model or rackmount base unit for use on a shared SCSI bus.

For complete hardware installation instructions, see the TL881 MiniLibrary System User's Guide or TL891 MiniLibrary System User's Guide.

8.12.2.1.1    Setting the Standalone MiniLibrary Tape Drive SCSI ID

The control panel on the front of the TL891 and TL892 MiniLibraries is used to display power-on self-test (POST) status, display messages, and to set up MiniLibrary functions.

When power is first applied to a MiniLibrary, a series of POST diagnostics are performed. During POST execution, the MiniLibrary model number, current date and time, firmware revision, and the status of each test is displayed on the control panel.

After the POST diagnostics have completed, the default screen is shown:

DLT0 Idle
DLT1 Idle
Loader Idle
0> _ _ _ _ _ _ _ _ _ _ <9

The first and second lines of the default screen show the status of the two (if present) drives. The third line shows the status of the library robotics, and the fourth line is a map of the magazine, with the numbers from 0 through 9 representing the cartridge slots. Rectangles on this line indicate cartridges that are present in the corresponding slot of the magazine.

For example, this fourth line ( 0> X X _ _ _ _ _ _ _ _ <9, where an X represents a rectangle) indicates that cartridges are installed in slots 0 and 1.

Note

There are no switches for setting a mechanical SCSI ID for the tape drives. The SCSI IDs default to five. The MiniLibrary sets the electronic SCSI ID very quickly, before any device can probe the MiniLibrary, so the lack of a mechanical SCSI ID does not cause any problems on the SCSI bus.

To set the SCSI ID, follow these steps:

1. From the Default Screen, press the Enter button to enter the Menu Mode, displaying the Main Menu.

   Note

   When you enter the Menu Mode, the Ready light goes out, an indication that the module is off line, and all medium changer commands from the host return a SCSI "not ready" status until you exit the Menu Mode and the Ready light comes on again.

2. Press the down arrow button until the Configure Menu item is selected, then press the Enter button to display the Configure submenu.

   Note

   The control panel up and down arrows have an auto-repeat feature. When you press either button for more than half a second, the control panel behaves as if you were pressing the button about four times per second. The effect stops when you release the button.

3. Press the down arrow button until the Set SCSI item is selected and press the Enter button.

4. Select the tape drive (DLT0 Bus ID: or DLT1 Bus ID:) or library robotics (LIB Bus ID:) whose SCSI bus ID you want to change. The default SCSI IDs are as follows:

   • Lib Bus ID: 0

   • DLT0 Bus ID: 4

   • DLT1 Bus ID: 5

   Use the up or down arrow button to select the item for which you need to change the SCSI ID. Press the Enter button.

5. Use the up or down arrow button to scroll through the possible SCSI ID settings. Press the Enter button when the desired SCSI ID is displayed.

6. Repeat steps 4 and 5 to set other SCSI bus IDs as necessary.

7. Press the Escape button repeatedly until the default menu is displayed.

8.12.2.1.2    Cabling the TL881 or TL891 DLT MiniLibrary

There are six 68-pin, high-density SCSI connectors on the back of the TL881 or TL891 DLT MiniLibrary standalone model or rackmount base unit. The two leftmost connectors are for the library robotics controller. The middle two are for tape drive 1. The two on the right are for tape drive 2 (if the second tape drive is installed).

Note

The tape drive SCSI connectors are labeled DLT1 (tape drive 1) and DLT2 (tape drive 2). The control panel designation for the drives is DLT0 (tape drive 1) and DLT1 (tape drive 2).

The default for the TL881 or TL891 DLT MiniLibrary is to place the robotics controller and tape drive 1 on the same SCSI bus (Figure 8-18). A 30-centimeter (11.8-inch) SCSI jumper cable is provided with the unit. Plug this cable into the second connector (from the left) and the third connector. If the MiniLibrary has two drives, place the second drive on the same SCSI bus with another 30-centimeter (11.8-inch) SCSI bus jumper cable, or place it on its own SCSI bus.

Notes

The internal cabling of the TL881 and TL891 is too long to allow external termination with a trilink/terminator combination. Therefore, the TL881 or TL891 must be the last device on the shared SCSI bus. They may not be removed from the shared SCSI bus without stopping all ASE services that generate activity on the bus.

To achieve system performance capabilities, we recommend placing no more than two tape drives on a SCSI bus.

We recommend that tape devices be placed on separate shared SCSI buses, and that there be no storage devices on the SCSI bus.

The cabling depends on whether or not there are one or two drives, and for the two-drive configuration, if each drive is on a separate SCSI bus.

Note

It is assumed that the library robotics controller is on the same SCSI bus as tape drive 1.

To connect the library robotics and one drive to a single shared SCSI bus, follow these steps:

1. Connect a 328215-00X, BN21K, or BN21L between the last Y cable or trilink connector on the bus to the leftmost connector (as viewed from the rear) of the MiniLibrary. The 328215-004 is a 20-meter (65.6-foot) cable.

2. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (second connector from the left) and the left DLT1 connector (the third connector from the left).

3. Install an HD68 differential terminator (such as an H879-AA) on the right DLT1 connector (the fourth connector from the left).

To connect the drive robotics and two drives to a single shared SCSI bus, follow these steps:

1. Connect a 328215-00X, BN21K, or BN21L between the last trilink connector on the bus to the leftmost connector (as viewed from the rear) of the MiniLibrary.

2. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (the second connector from the left) and the left DLT1 connector (the third connector from the left).

3. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost DLT1 connector (the fourth connector from the left) and the left DLT2 connector (the fifth connector from the left).

4. Install an HD68 differential (H879-AA) terminator on the right DLT2 connector (the rightmost connector).

To connect the drive robotics and one drive to one shared SCSI bus and the second drive to a second shared SCSI bus, follow these steps:

1. Connect a 328215-00X, BN21K, or BN21L between the last trilink connector on one shared SCSI bus to the leftmost connector (as viewed from the rear) of the MiniLibrary.

2. Connect a 328215-00X, BN21K, or BN21L between the last trilink connector on the second shared SCSI bus to the left DLT2 connector (the fifth connector from the left).

3. Install a 30-centimeter (11.8-inch) SCSI bus jumper between the rightmost robotics connector (the second connector from the left) and the left DLT1 connector (the third connector from the left).

4. Install an HD68 differential (H879-AA) terminator on the right DLT1 connector (the fourth connector from the left) and install another HD68 differential terminator on the right DLT2 connector (the rightmost connector).

Figure 8-18 shows an example of a TruCluster configuration with a TL891 standalone MiniLibrary connected to two shared SCSI buses.

Figure 8-18:  TL891 Standalone Cluster Configuration

Table 8-19 lists the components that are used to create the cluster that is shown in Figure 8-18.

Table 8-19:  Hardware Components Used to Create the Configuration Shown in Figure 8-18

8.12.2.2    Preparing a TL881 or TL891 Rackmount MiniLibrary for Shared SCSI Bus Usage

A TL881 or TL891 MiniLibrary base unit may also be used in a rackmount configuration with an expansion unit, data units, and other base units, to add tape drive and/or cartridge capacity to the configuration.

The expansion unit is installed above the TL881 or TL891 DLT MiniLibrary base or data units in a SW500, SW800, or RETMA cabinet.

For complete hardware installation instructions, see the TL881 MiniLibrary System User's Guide or TL891 MiniLibrary System User's Guide.

The topics in this section provide information on preparing the rackmount TL881 or TL891 DLT MiniLibrary for use on a shared SCSI bus.

It is assumed that the expansion unit, base modules, and pass-through and motor mechanism have been installed.

8.12.2.2.1    Cabling the Rackmount TL881 or TL891 DLT MiniLibrary

You must make the following connections to render the DLT MiniLibrary system operational:

• Expansion unit to the pass-through motor mechanism: The motor mechanism cable is about 1 meter (3.3 feet) long and has a DB-15 connector on each end. Connect it between the connector labeled Motor on the expansion unit to the motor on the pass-through mechanism.

  Note

  This cable is not shown in Figure 8-19 because the pass-through mechanism is not shown in the figure.

• Robotics control cables from the expansion unit to each base unit or data unit: These cables have a DB-9 male connector on one end and a DB-9 female connector on the other end. Connect the male end to the Expansion Unit Interface connector on the base unit or Diagnostic connector on the data unit and the female end to any Expansion Modules connector on the expansion unit.

  Note

  It does not matter which interface connector you connect to a base unit or a data unit.

• SCSI bus connection to the expansion unit robotics: Connect the shared SCSI bus that will control the robotics to one of the SCSI connectors on the expansion unit with a 328215-00X, BN21K, or BN21L cable. Terminate the SCSI bus with an HD68 terminator (such as an H879-AA) on the other expansion unit SCSI connector.

• SCSI bus connection to each of the base module tape drives: Connect a shared SCSI bus to one of the DLT1 or DLT2 SCSI connectors on each of the base modules with 328215-00X, BN21K, or BN21L cables. Terminate the other DLT1 or DLT2 SCSI bus connection with an HD68 terminator (H879-AA).

  You can daisy chain between DLT1 and DLT2 (if present) with a 30-centimeter (11.8-inch) SCSI bus jumper (supplied with the TL881 or TL891). Terminate the SCSI bus at the tape drive on the end of the shared SCSI bus with an HD68 terminator (H879-AA).

  Notes

  Do not connect a SCSI bus to the SCSI connectors for the library connectors on the base modules.

  We recommend that no more than two tape drives be on a SCSI bus.

Figure 8-19 shows a TL891 DLT MiniLibrary configuration with an expansion unit, a base unit, and a data unit. The library robotics expansion unit is on one shared SCSI bus and the two tape drives in the base unit are on separate, shared SCSI buses. The data unit is not on a shared SCSI bus because it does not contain any tape drives but tape cartridges only. The pass-through mechanism and cable to the library robotics motor are not shown in this figure.

For more information on cabling the units, see Section 8.12.2.1.2. With the exception of the robotics control on the expansion module, a rackmount TL881 or TL891 DLT MiniLibrary is cabled in the same manner as a tabletop unit.

Figure 8-19:  TL891 DLT MiniLibrary Rackmount Configuration

Table 8-20 list the components that are used to create the cluster that is shown in Figure 8-19.

Table 8-20:  Hardware Components Used to Create the Configuration Shown in Figure 8-19

8.12.2.2.2    Configuring a Base Unit as a Slave to the Expansion Unit

The TL881/TL891 base units are shipped configured as standalone systems. When they are used in conjunction with the MiniLibrary expansion unit, the expansion unit must control the robotics of each of the base units. Therefore, the base units must be configured as slaves to the expansion unit.

After the hardware and cables are installed, but before you power up the expansion unit in a MiniLibrary system for the first time, you must reconfigure each of the base units in the system as a slave. The expansion unit will not have control over the base unit robotics when you power up the MiniLibrary system, if you do not reconfigure the base unit as a slave.

To reconfigure a TL881/TL891 base unit as a slave to the MiniLibrary expansion unit, perform the following procedure on each base unit in the system.

1. Turn on the power switch on the TL881/TL891 base unit to be reconfigured.

   Note

   Do not power on the expansion unit. Leave it powered off until all base units have been reconfigured as slaves.

   After a series of self-tests have executed, the default screen will be displayed on the base module control panel:

   DLT0 Idle
   DLT1 Idle
   Loader Idle
   0> _ _ _ _ _ _ _ _ _ _ <9
   

   The default screen shows the state of the tape drives, loader, and number of cartridges present for this base unit. A rectangle in place of the underscore indicates that a cartridge is present in that location.

2. Press the Enter button to enter the Menu Mode, displaying the Main Menu.

3. Press the down arrow button until the Configure Menu item is selected, then press the Enter button.

   Note

   The control panel up and down arrows have an auto-repeat feature. When you press either button for more than half a second, the control panel behaves as if you were pressing the button about four times per second. The effect stops when you release the button.

4. Press the down arrow button until the Set Special Config menu is selected and press the Enter button.

5. Press the down arrow button repeatedly until the Alternate Config item is selected and press the Enter button.

6. Press the down arrow button to change the alternate configuration from the default (Standalone) to Slave. Press the Enter button.

7. After the selection stops flashing and the control panel indicates that the change is not effective until a reboot, press the Enter button.

8. When the Special Configuration menu reappears, turn the power switch off and then on again to cycle the power. The base unit is now reconfigured as a slave to the expansion unit.

9. Repeat the steps for each TL881/TL891 base unit present that is to be a slave to the expansion unit.

8.12.2.2.3    Powering Up the TL881/TL891 DLT MiniLibrary

When turning on power to the TL881 or TL891 DLT MiniLibrary, power must be applied to the expansion unit simultaneously or after power is applied to the base units and data units. If the expansion unit is powered on first, its inventory of modules may be incorrect and the contents of some or all of the modules will be inaccessible to the system and to the host.

When the expansion unit comes up, it will communicate with each base and data unit through the expansion unit interface and inventory the number of base units, tape drives, data units, and cartridges present in each base and data unit. After the MiniLibrary configuration has been determined, the expansion unit will communicate with each base and data unit and indicate to the modules which cartridge group that base or data unit contains.

When all initialization communication between the expansion module and each base and data unit has completed, the base and data units will display their cartridge numbers according to the remapped cartridge inventory.

8.12.2.2.4    Setting the SCSI IDs for a Rackmount TL881 or TL891 DLT MiniLibrary

After the base units have been reconfigured as slaves, each base unit control panel still provides tape drive status and error information, but all control functions are carried out from the expansion unit control panel. This includes setting the SCSI ID for each of the tape drives present.

To set the SCSI IDs for the tape drives in a TL881 or TL891 DLT MiniLibrary rackmount configuration, follow these steps:

1. Apply power to the MiniLibrary, ensuring that you power up the expansion unit after or at the same time as the base and data units.

2. Wait until power-on self-tests (POST) have terminated and the expansion unit and each base and data unit display the default screen.

3. At the expansion unit control panel, press the Enter button to display the Main Menu.

4. Press the down arrow button until the Configure Menu item is selected, and then press the Enter button to display the Configure submenu.

5. Press the down arrow button until the Set SCSI item is selected and press the Enter button.

6. Press the up or down arrow button to select the appropriate tape drive (DLT0 Bus ID:, DLT1 Bus ID:, DLT2 Bus ID:, and so on) or library robotics (Library Bus ID:) for which you want to change the SCSI bus ID. In a configuration with three base units, and assuming that each base unit has two tape drives, the top base unit contains DLT0 and DLT1. The next base unit down contains DLT2 and DLT3. The next base unit contains DLT4 and DLT5. The default SCSI IDs, after being reconfigured by the expansion unit, are as follows:

   • Library Bus ID: 0

   • DLT0 Bus ID: 1

   • DLT1 Bus ID: 2

   • DLT2 Bus ID: 3

   • DLT3 Bus ID: 4

   • DLT4 Bus ID: 5

   • DLT5 Bus ID: 6

7. Press Enter when you have the item selected for which you want to change the SCSI ID.

8. Use the up and down arrows to select the desired SCSI ID. Press the Enter button to save the new selection.

9. Press the Escape button once to return to the Set SCSI Submenu to select another tape drive or the library robotics, and then repeat steps 6, 7, and 8 to set the SCSI ID.

10. If there are other items that you want to configure, press the Escape button until the Configure submenu is displayed, then select the item to be configured. Repeat this procedure for each item that you want to configure.

11. If there are no more items to be configured, press the Escape button until the Default window is displayed.

Note

You do not have to cycle power to set the SCSI IDs.

8.13    Compaq ESL9326D Enterprise Library

The topics in this section provide an overview and hardware configuration information on preparing the ESL9326D Enterprise Library for use on a shared SCSI bus with the TruCluster Server.

8.13.1    General Overview

The Compaq StorageWorks ESL9326D Enterprise Library is the first building block of the Compaq ESL 9000 series tape library.

For more information on the ESL9326D Enterprise Library, see the following Compaq StorageWorks ESL9000 Series Tape Library documentation:

• Unpacking Guide

• Reference Guide

• Maintenance and Service Guide

• ESL9326 Tape Drive Upgrade Guide

• Pass-Through Mechanism Installation Guide

These tape devices have been qualified for use on shared SCSI buses with both the KZPSA-BB and KZPBA-CB host bus adapters. Ensure that the host bus adapter you use is supported on your system by searching the options list for your system at the following URL: http://www.compaq.com/alphaserver/products/options.html

8.13.2    ESL9326D Enterprise Library Overview

The ESL9326D Enterprise Library is an enterprise Digital Linear Tape (DLT) automated tape library with from 6 to 16 fast-wide, differential tape drives. This tape library uses the 35/70 DLT (DS-TZ89N-AV) differential tape drives. The SCSI bus connectors are 68-pin, high-density.

The ESL9326D Enterprise Library has a capacity of 326 DLT cartridges in a fixed storage array (back wall, inside the left door, and inside the right door). This provides a storage capacity of 11.4 TB uncompressed for the ESL9326D Enterprise Library using DLT Tape IV cartridges. The library can also use DLT Tape III or IIIXT tape cartridges.

The ESL9326D Enterprise Library is available as seven different part numbers, based on the number of tape drives:

You can upgrade a tape library with part number 146209-B21, which adds a 35/70 DLT tape drive. See the Compaq StorageWorks ESL9326 Tape Drive Upgrade Guide for more information.

Up to five ESL9000 series tape libraries can be connected together with pass-through mechanism, part number 161268-B21. See the ESL9326D QuickSpecs to determine the number of tape drives supported when the tape libraries are connected together. See the Compaq StorageWorks Pass-Through Mechanism Installation Guide for more information on the pass-through mechanism.

8.13.3    Preparing the ESL9326D Enterprise Library for Shared SCSI Bus Usage

The ESL9326D Enterprise Library contains library electronics (robotic controller) and from 6 to 16 35/70 DLT (DS-TZ89N-AV) fast-wide, differential DLT tape drives.

Tape devices are supported only on those shared SCSI buses that use the KZPSA-BB or KZPBA-CB host bus adapters.

Notes

The ESL9326D Enterprise Library is cabled internally for two 35/70 DLT tape drives on each SCSI bus. It arrives with the library electronics cabled to tape drives 0 and 1. Every other pair of tape drives is cabled together (2 and 3, 4 and 5, 6 and 7, and so on).

An extra SCSI bus jumper cable is provided with the ESL9326D Enterprise Library for those customers that do not have enough SCSI buses, and want to jumper two SCSI buses together and place four tape drives on the same SCSI bus.

We recommend that you place no more that two 35/70 DLT tape drives on a shared SCSI bus.

We also recommended that you do not place storage on shared SCSI buses that have tape drives.

The following sections describe how to prepare the ESL9326D Enterprise Library in more detail.

8.13.3.1    ESL9326D Enterprise Library Robotic and Tape Drive Required Firmware

Library electronics firmware V1.22 is the minimum firmware version that supports TruCluster Server.

The 35/70 DLT tape drives require V97 or later firmware. The firmware must be at V80 before you can upgrade to V97.

8.13.3.2    Library Electronics and Tape Drive SCSI IDs

Figure 8-20 shows the default robotics and tape drive SCSI IDs. If these SCSI IDs are not acceptable for your configuration and you need to change them, follow the steps in the Compaq StorageWorks ESL9000 Series Tape Library Reference Guide.

8.13.3.3    ESL9326D Enterprise Library Internal Cabling

The default internal cabling for the ESL9326D Enterprise Library is to place two 35/70 DLT tape drives on one SCSI bus.

Figure 8-20 shows the default cabling for an ESL9326D Enterprise Library with 16 tape drives. Each pair of tape drives is cabled together internally to place two drives on a single SCSI bus. If your model has fewer drives, all internal cabling is supplied. The terminators for the drives that are not present are not installed on the SCSI bulkhead.

Figure 8-20:  ESL9326D Internal Cabling

Note

Each internal cable is up to 2.5 meters (8.2 feet) long. The length of the internal cables, two per SCSI bus, must be taken into consideration when ordering SCSI bus cables.

The maximum length of a differential SCSI bus segment is 25 meters (82 feet), and the internal tape drive SCSI bus length is 5 meters (16.4 feet). Therefore, you must limit the external SCSI bus cables to 20 meters (65.6 feet) maximum.

8.13.3.4    Connecting the ESL9326D Enterprise Library to the Shared SCSI Bus

The ESL9326D Enterprise Library has 5 meters (16.4 feet) of internal SCSI bus cabling for each pair of tape drives. Because of the internal SCSI bus lengths, you cannot use a trilink connector or Y cable to terminate the SCSI bus external to the tape library as is done with other devices on the shared SCSI bus. You must terminate each SCSI bus at the end of the SCSI bus by installing a terminator on the SCSI bulkhead SCSI connector. Therefore, you must ensure that the ESL9326D Enterprise Library is on the end of the shared SCSI bus in TruCluster Server configurations.

Note

We recommend that you put disk storage devices on separate shared SCSI buses.

Use 328215-001 (5-meter; 16.4 foot), 328215-002 (10-meter; 32.8-foot), 328215-003 (15-meter; 49.2-foot), 328215-004 (20-meter; 65.6-foot), or BN21K (BN21L) cables of the appropriate length to connect the ESL9326D Enterprise Library to a shared SCSI bus. The entire shared SCSI bus, including ESL9326 internal cables, cannot exceed 25 meters (82 feet). Terminate each SCSI bus with a 330563-001 (or H879-AA) HD-68 terminator. Connect the cables and terminator on the SCSI bulkhead SCSI connectors as indicated in Table 8-21 to form shared SCSI buses.

Table 8-21:  Shared SCSI Bus Cable and Terminator Connections for the ESL9326D Enterprise Library

Notes

Each ESL9326D Enterprise Library arrives with one 330563-001 HD68 terminator for each pair of tape drives (one SCSI bus). The kit also includes at least one 330582-001 jumper cable to connect the library electronics to tape drives 0 and 1.

Tape libraries with more than six tape drives include extra 330582-01 jumper cables in case you do not have enough host bus adapters and you want to place more than two tape drives on a single SCSI bus (a configuration that we do not recommend).