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SCSI(7)


NAME

  SCSI, RAID - Small Computer System Interface


SYNOPSIS

  dsk#, tape#_d#, cdrom#


DESCRIPTION

  The operating system interfaces to disk and tape devices through the Small
  Computer System Interface (SCSI).  SCSI support is limited to the HP-
  supplied storage devices and certain third-party devices. To determine
  which named devices are supported in the default system, refer to the file
  /etc/ddr.dbase.  For example, the following devices are listed therein:

    ·  Winchester disks: RZ24L, RZ25, RZ25L, RZ25M, RZ28M, RZ29B, RZ55, RZ56,
       RZ58, RZ73, RZ74, RX23, RX26, RX33, IOMEGA ZIP,

    ·  RAID (Redundant Arrays of Independent Disks) SCSI controllers: HSZ10,
       HSZ40, HSZ80

    ·  Magnetic tapes: TZ30, TZK11, TLZ06, TKZ09, TKZ60, DLT8000, SDT-10000

    ·  Media Changers: TL800, ESL9000

    ·  Optical disks: RRD42, RRD43, RRD44

  Vendors can add their own devices to ddr.dbase.

  Refer to the Software Product Description (SPD) for a given release of the
  operating system for more information on processor-specific device support.

  Under the operating system, a SCSI device is referred to by a device
  identifier that is assigned by the operating system.	This name has no
  relationship to the descriptive name of the device, although in previous
  releases of the operating system disks such as the RZ74 mapped to a
  system-assigned rz# logical name (where # was the instance number of that
  disk.

  Current logical names for SCSI disks and tapes take the forms specified in
  the rz(8) and tz(7) reference pages, such as dsk? and tape?.	Refer to the
  dsfmgr(8) reference page for the naming conventions for disks, tapes and
  other devices, such as CD-ROM readers. Refer to the hwmgr(8) reference page
  for information on determining device names and other device data.

  SCSI Device Limits

  The number of possible target device IDs is determined by the controller
  type and method of connection, such as a multibus connection using fibre
  channel.  Refer to the emx(7) reference page for an example of device
  addressing.

  Device Special Files

  The dsfmgr command creates device special files for all the devices that
  are attached to SCSI controllers.  This event occurs automatically on
  system startup, and no administrative intervention is required unless an
  event requires that a device be renamed or its I/O be reassigned.  In such
  cases, you can use dsfmgr and hwmgr to manage SCSI devices and their
  associated device special files without the need to calculate values from
  their Bus, Target ID, and LUN data.


RESTRICTIONS

  The SCSI device driver is not warrantied to operate with optical disks
  other than the devices listed in /etc/ddr.dbase/.  The SCSI driver attempts
  to support, on a best-effort basis, disks and magnetic tapes supplied by
  other vendors.

  The following notes apply to the driver's handling of disks from other
  vendors:

    ·  These disks are identified using the following command:

	    # hwmgr -get attribute -a name

       This command will return the device name SCSI-WWID (World-Wide
       Identifier) for all devices on the system, which includes the model
       name of the device.  You can filter the output by specifying
       categories of devices.

    ·  Disks are assigned a default partition table. The default table can be
       modified by editing the ccmn_rzxx_sizes[8] entry in the
       /usr/sys/data/cam_data.c file. The disklabel command can also be used
       to modify the partition table on an RZxx disk.


SEE ALSO

  atapi_ide(7), dsfmgr(8), emx(7), hwmgr(8), rz(7), tz(7), disklabel(8),
  ddr.dbase(4)

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