## Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Definitions obtained from the Storage Networking Industry Association (SNIA) Dictionary are indicated with "(SNIA)" at the end. For the complete SNIA Dictionary, go to www.snia.org/education/dictionary.

A

agent

The component of the Sun Storage Automated Diagnostic Environment software that collects health and asset information about the system.

alarm

A type of event that requires service action. See also event.

array

Multiple disk drives that function as a single storage device. A high-availability (HA) array configuration has multiple controller and expansion trays of disk drives. See also array type.

array hot-spare

A spare disk within an array that is used for failover when any of the active disks fail. See also dedicated hot-spare and hot-spare.

array type

In the Sun StorEdge 6920 system, an internal storage array configuration that is defined by the number of controller units and the total number of storage trays. For example, a 2x4 storage array configuration consists of a total of four storage trays, two of which are controller trays.

asynchronous queue

In the context of data replication, a queue used to store writes that are to be replicated to the remote site. After the writes have been put into the queue, the writes are acknowledged to the application and then forwarded to the remote site as network capabilities permit. The asynchronous queue is a persistent queue, so in the event of a disaster at the primary site, the data in the asynchronous queue is not lost.

asynchronous replication

A form of data replication in which application write operations are written to the primary site and to the asynchronous queue on the primary site. The asynchronous queue forwards queued writes to the secondary site as network capabilities permit. The write operations to the primary site are confirmed, regardless of when, or whether, they are replicated successfully to the secondary site. Deferring the secondary copy removes long-distance propagation delays from the I/O response time. See also synchronous replication.

autosynchronization

An option enabled at the primary site that attempts to synchronize replication sets or consistency groups whenever a link is established. With autosynchronization, synchronization continues even if there are link errors, for example.

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B

base cabinet

The Sun StorEdge 6920 system's main cabinet, which contains a Data Services Platform (DSP), storage trays, a Storage Service Processor with a USB flash disk, a Storage Service Processor accessory tray, a service panel, and power distribution units (PDUs). The base cabinet is pre-wired with Ethernet, Fibre Channel, and power cables and can be connected to one or two expansion cabinets. See also expansion cabinet.

break

To remove a mirror component from the mirror, voiding its relationship with the other mirror components. The broken mirror component becomes a standalone volume in the system, and synchronization with the other mirror components is not maintained. See also mirror component and split.
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C

captive storage

See internal storage.

combo card

See storage I/O (SIO) card.

component

See mirror component.

concatenation

A storage allocation method in which sequential blocks on a disk are linked together to form a larger logical device. This method combines the storage potential of several physical devices. See also striping.

consistency group

A collection of replication sets grouped together to ensure write order consistency across all the replication sets' primary volumes. An operation on a consistency group applies to all the replication sets within the consistency group, and consequently to their volumes.

controller pair

In the Sun StorEdge 6920 system, a pair of controller units that services a group of storage trays.

controller tray

A storage tray with an installed RAID controller and up to 14 disk drives. In a Sun StorEdge 6920 system, a pair of controller trays is the smallest possible storage array configuration, the 2x2 array type. See also expansion tray.

controller unit

The card that manages RAID functions and failover characteristics for an array.

control path

The route used for communication of system management information, usually an out-of-band connection. See also out-of-band management.

copy on write

A technique for maintaining a point in time copy of a collection of data by copying only data which is modified after the instant of replicate initiation. The original source data is used to satisfy read requests for both the source data itself and for the unmodified portion of the point in time copy. (SNIA) See also snapshot reserve space.

customer LAN

See site LAN.

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D

DAS

See direct attached storage (DAS).

data host

Any host that uses the system for storage. A data host can be connected directly to the system (direct attached storage, or DAS) or can be connected to an external switch that supports multiple data hosts (storage area network, or SAN).

data path

The route taken by a data packet between a data host and the storage array. See also in-band management.

data replication

A disaster recovery and business continuance method in which a primary volume at the local site and a secondary volume at a remote site contain the same data on an ongoing basis, thereby protecting user data.

Data Services Platform (DSP)

The controller component of the Sun StorEdge 6920 system, which consolidates and virtualizes storage so that all storage in the system can be managed as a single scalable entity.

data striping

See striping.

dedicated hot-spare

A disk that serves as the hot-spare for one and only one virtual disk in a storage tray.

degraded

The condition of a volume in which one or more input or output data paths are not operating properly. Although the redundant failover paths are still intact, a degraded volume holds no significant value for the storage configuration and should therefore probably be deleted from the system.

dependent copy

See snapshot.

direct attached storage (DAS)

A storage architecture in which the systems that store data are connected physically to storage elements.

disk

A physical, non-volatile, rewritable data storage device. See also virtual disk.

domain

See storage domain.

DSP

See Data Services Platform (DSP).

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E

electro-magnetic interference

Radiated electro-magnetic signals that can interfere with the normal transmission of information.

EMI

See electro-magnetic interference.

event

Any condition reported by a device to the Sun Storage Automated Diagnostic Environment agent. See also alarm.

expansion cabinet

In the Sun StorEdge 6920 system, a cabinet, pre-wired with Ethernet, Fibre Channel, and power cables, connected to the base cabinet to increase storage capacity. A power management cable connects the service panels of the cabinets, and the Fibre Channel/Ethernet cable connects the I/O panels of the cabinets. See also base cabinet.

expansion tray

In the Sun StorEdge 6920 system, a storage tray that has up to 14 disk drives but does not have a RAID controller. This type of storage tray is used to expand the capacity of an array and must be attached to a controller tray to function. See also controller tray.

extend

In the context of managing volumes, to increase a volume's capacity.

extent

A set of contiguous blocks with consecutive logical addresses on a physical or virtual disk.

external storage

A physical disk or storage array connected to the Sun StorEdge 6920 system located outside of the base or expansion cabinets.

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F

fabric

A Fibre Channel switch or two or more Fibre Channel switches interconnected in such a way that data can be physically transmitted between any two N_Ports on any of the switches. (SNIA)

failover and recovery

The process of changing the data path automatically to an alternate path.

Fast Start operation

An option of the suspend operation and the procedure in which a method such as a backup tape is used to copy data from the primary volume to the secondary volume. This procedure is used to avoid the initial step in which you send the primary volume's data over the physical link. For example, network bandwidth might justify a Fast Start procedure. See also resume operation and suspend operation.

fault signature analysis

An algorithm applied by the Sun Storage Automated Diagnostic Environment software to a specific set of events that can be correlated by time and locality to a specific cause. Fault signature analysis assumes that the most significant event is the most probable cause and aggregates the remaining events underneath that event to improve the signal/noise ratio when a single probable cause might result in a multitude of events.

FC

See Fibre Channel (FC).

FC port

See Fibre Channel (FC) port.

FC switch

See Fibre Channel (FC) switch.

Fibre Channel (FC)

A set of standards for a serial I/O bus capable of transferring data between two ports at up to 100 MBytes/second, with standards proposals to go to higher speeds. Fibre Channel supports point to point, arbitrated loop, and switched topologies. Fibre Channel was completely developed through industry cooperation, unlike SCSI, which was developed by a vendor and submitted for standardization after the fact. (SNIA)

Fibre Channel (FC) port

A port on an array that connects data hosts, external storage, or internal storage. See also host port and storage port.

Fibre Channel (FC) switch

A networking device that can send packets directly to a port associated with a given network address in a Fibre Channel storage area network (SAN). Fibre Channel switches can be used to expand the number of data host or external storage device connections. Each switch is managed by its own management software.

field-replaceable unit (FRU)

An assembly component that is designed to be replaced on site, without the system's having to be returned to the manufacturer for repair.

flash card or disk

See USB flash disk.

force break

To remove a mirror component (mirrored volume) from the mirror before the resilvering process is complete, causing the condition of its data to be degraded. Just as with a break operation, the mirror component for which you implement a force break becomes a standalone volume in the system; however, it is inaccessible and should probably be deleted. See also break, degraded, mirror component, and resilvering.

free

The state of a volume that is not mapped to initiators.

FRU

See field-replaceable unit (FRU).

FSA

See fault signature analysis.

full synchronization

A resume operation in which a complete volume-to-volume copy occurs. Unlike a normal resume operation, in which a copy of differences between the primary and secondary volumes occurs, a full synchronize operation copies the entire contents of the volume. The system performs a full synchronize operation the first time you resume data replication on a replication set. See resume operation and synchronization.

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H

HBA

See host bus adapter (HBA).

host bus adapter (HBA)

An I/O adapter than connects a host I/O bus to a computer's memory system. (SNIA) See also initiator.

host port

A port on the I/O panel that connects to a data host. See also storage port.

hot-spare

The drive used by a controller to replace a failed disk. See also array hot-spare and dedicated hot-spare.

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I

in-band management

Transmission of a protocol other than the primary data protocol over the same medium as the primary data protocol. Management protocols are a common example of in-band transmission. (SNIA) See also out-of-band management.

independent copy

See mirror component and mirroring.

initiator

A system component that initiates an I/O operation over a Fibre Channel (FC) network. If allowed by FC fabric zoning rules, each host connection within the FC network has the ability to initiate transactions with the storage array. Each host in the FC network represents a separate initiator, so if a host is connected to the system through two host bus adapters (HBAs), the system identifies two different initiators (similar to multi-homed, Ethernet-based hosts). In contrast, when multipathing is used in round-robin mode, multiple HBAs are grouped together, and the multipathing software identifies the group of HBAs as a single initiator.

internal storage

In the Sun StorEdge 6920 system, an array physically housed in the Sun StorEdge 6920 system base cabinet, or expansion cabinet, and managed by the system management software. See also external storage.

I/O panel

In the Sun StorEdge 6920 system, the portion of the service panel that provides Fibre Channel (FC) port connections for data hosts, internal and external storage, gigabit Ethernet ports for remote replication, power connections for up to two expansion cabinets, and Ethernet and FC connections for expansion cabinets. See also service panel and Service Processor panel.

IOPS

A measure of transaction speed, representing the number of input and output transactions per second.

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L

LAN

See local area network (LAN).

legacy volume

An entire logical unit number (LUN) on an external storage array that you can use in specific ways as if it were a local volume, while preserving the user data on that external storage array. You can apply the system's data services to a legacy volume; however, you cannot extend a legacy volume.

local area network (LAN)

A communications infrastructure designed to use dedicated wiring over a limited distance (typically a diameter of less than five kilometers) to connect a large number of intercommunicating nodes.

logical unit number (LUN)

The SCSI identifier of a logical unit with a target. (SNIA)

LUN

See logical unit number (LUN).

LUN mapping

The process by which volume permissions (read only, read/write, or none) are assigned to an initiator.

LUN masking

The process by which a mapped initiator is filtered.

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M

MAC address

See media access control (MAC) address.

management host

A host with an in-band and/or out-of-band network connection to the storage system that is used to manage the system. A management host can have monitoring software installed, such as a remote CLI package, Sun StorEdge Enterprise Storage Manager, Sun Storage Automated Diagnostic Environment (Enterprise Edition), or a third-party monitoring program. A management host can also be used to run management software on another machine through a network connection

management interface card (MIC)

In the Sun StorEdge 6920 system, the card on which the management software resides. Each Data Services Platform has two MICs, which operate in a master/alternate master mode.

management path

See out-of-band management.

master agent

In Sun Storage Automated Diagnostic Environment, Enterprise Edition software, the primary health and monitoring agent designated by the user to act as the aggregation point for one or more slave agents. The responsibilities of the master agent include analyzing the events forwarded from the slave agents, generating alarm notification to local and remote recipients, and provisioning the user interface to the slave agents. See also master/alternate master and slave agent.

master/alternate master

In Sun Storage Automated Diagnostic Environment, Enterprise Edition, a slave agent designated by the user to act as the temporary master agent if the master agent fails to send a heartbeat signal to the alternate master during a defined time period. The alternate master does not assume all the responsibilities of the master agent; it simply acts as the aggregation point for the remaining slave agents, collecting their events, until the master agent returns to active service. See also master agent and slave agent.

media access control (MAC) address

The physical address identifying an Ethernet controller board. The MAC address, also called an Ethernet address, is set at the factory and must be mapped to the IP address of the device.

MIC

See management interface card (MIC).

mirror

A special type of volume in the Sun StorEdge 6920 system, consisting of up to four separate yet equal mirror components you can access independently (through the mirror) and use to track changes to and update your data set and manage your data migration strategy.

mirror component

One of up to four individual copies of the same data set that constitute a mirror in the Sun StorEdge 6920 system. When you perform an action on a mirror component, the resilvering process synchronizes the mirror so that each component is an equal yet separate copy of the same data set. You can perform a variety of operations on a mirror component. See also break, force break, rejoin, reverse rejoin, resilvering, and split.

mirrored volume

See mirror and mirror component.

mirroring

A form of storage - also called RAID Level 1, independent copy, and real-time copy - whereby two or more independent, identical copies of data are maintained on separate media. Typical mirroring technologies enable the cloning of data sets to provide redundancy for a storage system. The enables you to create and manipulate up to four equal mirror components for each mirror and to access each component individually in order to track changes to and preserve the integrity of your data. See also mirror and mirror component.

mirror log

Area of the storage pool used to track the state of mirror components (such as resilvering progress) relative to the mirror as a whole.

multipathing

A design for redundancy that provides at least two physical paths to a target.

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N

Network Storage Command Center (NSCC)

A repository and application comprised of a database and a browser-based user interface, designed and maintained by Sun, to collect and analyze health and performance data from supported storage devices

non-captive storage

See external storage.

NSCC

See Network Storage Command Center (NSCC).

notification

The process performed by the Sun Storage Automated Diagnostic Environment master agent when one or more events require fault reporting to a configured notification recipient such as a local email address, an SNMP port, or a remote service such as the Sun StorEdge Remote Response service. The master agent constructs the event and assembles the information necessary to transmit the event by way of the user-configured transport mechanism. The monitoring and diagnostic software supports notification of one or more notification recipients to satisfy the desired level of notification.

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O

original volume

The starting point for a mirrored volume or data migration. In the context of mirroring, see also primary component.

out-of-band management

Transmission of management information for Fibre Channel components outside of the Fibre Channel network, typically over Ethernet. (SNIA) The Sun StorEdge 6920 system is managed over an out-of-band network by way of an Ethernet connection between the service panel and the local area network (LAN). See also in-band management.

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P

parallel monitoring

A monitoring control that allows the agent to examine more than a single device in parallel during an agent polling cycle. The positive effect of increasing the value for this control beyond the default (1) is to speed up the monitoring of devices when a large population exists The negative effect of increasing the value of this control is that the agents will consume more memory and CPU cycles.

parent volume

The volume for which a snapshot is taken. See also snapshot.

patch

A software or firmware update for a storage device or device component.

PDU

See power distribution unit (PDU).

point in time copy

A fully usable copy of a defined collection of data that contains an image of the data as it appeared at a single point in time. The copy is considered to have logically occurred at that point in time, but implementations may perform part or all of the copy at other times (e.g., via database log replay or rollback) as long as the result is a consistent copy of the data as it appeared at that point in time. Implementations may restrict point in time copies to be read-only or may permit subsequent writes to the copy. (SNIA)

In the context of data replication, the storage system that houses the primary replication set, which is the remote counterpart of the secondary site. Also known as the local site copy. See also snapshot.

policy

A rule or guideline that can result in an automatic response to a system event.

pool

See storage pool.

power distribution unit (PDU)

In the Sun StorEdge 6920 system,the assembly that provides power management for the system. The Sun StorEdge 6920 system provides two PDUs that enable the management software to control the distribution of power to system components for Lights-Out Management (LOM) and field-replaceable unit (FRU) service actions.

primary peer

In a data replication configuration, one of a pair of physically separate systems on which the primary replication set resides. The primary peer copies user data to its counterpart, which is the remote, secondary peer.

primary component

The first component created to establish a mirrored volume. See also mirror, mirror component, and mirrored volume.

primary volume

In a data replication configuration, the volume that contains the original user data that the primary peer replicates to the secondary peer.

profile

See storage profile.

provisioning

The process of allocation and assignment of storage to hosts.

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R

RAID

An acronym for Redundant Array of Independent Disks, a family of techniques for managing multiple disks to deliver desirable cost, data availability, and performance characteristics to host environments. (SNIA)

real-time copy

See mirroring.

reconstruction

The process of rebuilding of lost data on a replacement disk after a disk failure.

rejoin

To move a split mirror component back into the mirror such that, when the resilvering process is complete, the mirror component has been made identical to all other mirror components in the mirror. See also mirror component, reverse rejoin, and split.

remote scripting CLI client

A command-line interface (CLI) that enables you to manage the system from a remote management host. The client communicates with the management software through a secure out-of-band interface, HTTPS, and provides the same control and monitoring capability as the browser interface. The client must be installed on a host that has network access to the system.

replication

See data replication.

replication bitmap

The bitmap that tracks changes to the primary volume. Writes issued to the primary peer are noted in the replication bitmap. The replication set at the secondary peer also includes a replication bitmap that tracks changes if a role reversal assigns the secondary volume the role of primary.

replication link

A logical connection associated with a Gigabit Ethernet port that transports data and replication control commands between primary and secondary sites. The Gigabit Ethernet ports at both sites must be enabled for data replication and be configured with the remote site's IP information.

replication peer

One of a pair of complementary components that are on physically separate systems. For example, user data is copied to a remote system, which is the counterpart, or remote peer, of the system on which that user data resides.

replication set

A local volume paired with reference to a single remote volume on a remote peer. A replication set works in conjunction with an identically configured replication set on the remote peer to provide an instance of replication. The local volume within a replication set is associated with a replication bitmap and, depending on the set's attributes, with an asynchronous queue.

resilvering

The synchronization of mirror components such that, when the process is complete, the mirror comprises equal, independent copies of the same data set. Resilvering occurs when you have performed a rejoin or reverse rejoin operation on a mirror component.

resnap

To create a snapshot again and replace the old with the new.

resume operation

In the context of data replication, a synchronization operation to establish an identical copy of the primary volume's user data on the secondary volume. The data is synchronized when replication occurs. Synchronization can be initiated by either the user or the system. See also autosynchronization, suspend operation, and synchronization.

reverse rejoin

To move a split mirror component back into the mirror such that, when the resilvering process is complete, all mirror components in the mirror have been made identical to the previously split mirror component. See also break, mirror component, rejoin, resilvering, and split.

reverse synchronization

See role reversal.

revision analysis

In Sun Storage Automated Diagnostic Environment, Enterprise Edition, the process of collecting the current revision information for the software and firmware elements of the system and comparing them against a set of acceptable levels. See also revision maintenance.

revision backout

The removal of a patch update on a storage device or device component. See also revision upgrade.

revision maintenance

A system process that combines performing revision analysis on the elements of the system and locating, acquiring, and installing the necessary deliverables to bring elements up to an acceptable revision level. See also revision analysis.

revision upgrade

The installation of a patch update on a storage device or device component. See also revision backout.

role reversal

In the context of data replication, a procedure in which the secondary host is assigned the role of primary host within an established replication set, and the primary volume is updated with the contents of the secondary volume. Role reversal is a failover technique used when the primary site fails and for disaster rehearsal.

rollback

The process by which a volume's data is reset to become identical to a snapshot taken of that volume.

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S

SAN

See storage area network (SAN).

secondary peer

One of a pair of physically separate systems on which the secondary replication set resides. The secondary peer is the recipient of user data from its remote counterpart, which is the primary peer.

secondary volume

The remote counterpart of the primary volume. The secondary volume is the replicated copy of the primary volume. You can map or create a volume snapshot of a secondary volume. You cannot read from or write to a secondary volume unless it is in scoreboard mode or you change its role to primary.

Service Advisor

A diagnostic tool component that provides tools and procedures for performing service on storage devices.

service panel

In the Sun StorEdge 6920 system, a group of input and output connections located at the back of the base cabinet that provides the cabling interface to both control path functions and data path functions. The service panel consists of the Service Processor panel and the I/O panel. See also I/O panel and Service Processor panel.

Service Processor panel

In the Sun StorEdge 6920 system, the portion of the service panel that contains a modem connection, LAN connections, serial ports, and an AUX port for connection of the Data Services Platform (DSP) management interface card (MIC).

SFC

See switch fabric card (SFC).

Simple Mail Transfer Protocol (SMTP)

A protocol for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an email client using either Post Office Protocol (POP) or Internet Message Access Protocol (IMAP). In addition, SMTP is generally used to send messages from a mail client to a mail server. This is why you need to specify both the POP or IMAP server and the SMTP server when you configure your email application. (Webopedia)

Simple Network Management Protocol (SNMP)

An IETF protocol for monitoring and managing systems and devices in a network. The data being monitored and managed is defined by a Management Information Base (MIB). The functions supported by the protocol are the request and retrieval of data, the setting or writing of data, and traps that signal the occurrence of events. (SNIA)

SIO card

See storage I/O (SIO) card.

site LAN

The local area network at your site. The system connects to your LAN through the USER LAN port on the service panel. When the system is connected to your LAN, the system can be managed through a browser from any host on the LAN.

slave agent

In Sun Storage Automated Diagnostic Environment, Enterprise Edition, a health and monitoring agent that collects health and performance data from the devices it has been designated to monitor and forwards events to the master or alternate master agent for evaluation and notification processing. Slave agents cannot function completely without a master or alternate master agent. See also master agent and master/alternate master.

SMTP

See Simple Mail Transfer Protocol (SMTP).

snapshot

An instantaneous copy of volume data at a specific point in time. Snapshots are stored in snapshot reserve space on the (parent) volume for which they are taken.

snapshot reserve space

Storage space, taken from a pool, where the system stores snapshot copies of the parent volume's original data before it is overwritten. See also storage pool.

split

To separate a mirror component from the mirror, with the intent to rejoin it later. A split component is counted toward the limit of four mirror components per mirror and continues to be tracked by the system as part of the mirror. See also mirror component, rejoin, reverse rejoin, and snapshot.

SRC

See storage resource card (SRC).

SSRR

See Sun StorEdge Remote Response service.

storage area network (SAN)

An architecture in which the storage elements are connected to each other and to a server that is the access point for all systems that use the SAN to store data.

storage domain

A secure container that holds a subset of the system's total storage resources. Multiple storage domains can be created to securely partition the system's total set of storage resources. This enables you to organize multiple departments or applications into a single storage management infrastructure.

storage I/O (SIO) card

In the Sun StorEdge 6920 system, a card that provides the Fibre Channel (FC) ports for the Data Services Platform (DSP). This card is always paired with a storage resource card (SRC). The Sun StorEdge 6920 system supports two types of SIO cards. The SIO-8 card has eight FC ports and the SIO COMBO card has six FC ports and one Gigabit Ethernet port. See also storage resource card (SRC).

storage pool

A container that groups physical disk capacity (abstracted as virtual disks in the browser interface) into a logical pool of available storage capacity. A storage pool's characteristics are defined by a storage profile. You can create multiple storage pools to segregate storage capacity for use in various types of applications (for example, high throughput and online transaction-processing applications).

storage port

In the Sun StorEdge 6920 system, a port on the I/O panel that connects to internal storage. See also host port.

storage profile

A defined set of storage performance characteristics such as RAID level, segment size, dedicated hot-spare, and virtualization strategy. You can choose a predefined profile suitable for the application that is using the storage, or you can create a custom profile.

storage resource card (SRC)

In the Sun StorEdge 6920 system, a card that provides the storage processors for the Data Services Platform (DSP). An SRC is always paired with a storage I/O (SIO) card. See also storage I/O (SIO) card.

storage resource card (SRC) set

In the Sun StorEdge 6920 system, two cards in the Data Services Platform (DSP) that together provide the Fibre Channel (FC) and Gigabit Ethernet interfaces: the storage resource card (SRC) and the storage I/O (SIO) card. Two to four SRC sets can be installed in the DSP to provide the ports for connecting data hosts to the system. See also storage I/O (SIO) card.

Storage Service Processor

In the Sun StorEdge 6920 system a management device integrated into the system that provides unified management access to system components, as well as local and remote management and maintenance. The Storage Service Processor also supports automatic upgrades of patches, firmware, and software.

Storage Service Processor accessory tray

In the Sun StorEdge 6920 system the portion of the Storage Service Processor that contains a modem, router with a firewall, Ethernet hub, and network terminal concentrator (NTC).

storage tray

In the Sun StorEdge 6920 system an enclosure containing disks. A storage tray with a RAID controller is called a controller tray; a storage tray without a controller is called an expansion tray. See also controller tray and expansion tray.

store-and-forward

See asynchronous replication.

stripe size

The number of blocks in a stripe. A striped array's stripe size is the stripe depth multiplied by the number of member extents. A parity RAID array's stripe size is the stripe depth multiplied by one less than the number of member extents. (SNIA) See also striping.

striping

Short for data striping; also known as RAID Level 0 or RAID 0. A mapping technique in which fixed-size consecutive ranges of virtual disk data addresses are mapped to successive array members in a cyclic pattern. (SNIA) See also concatenation.

SunMC

See Sun Management Center (SunMC).

Sun Management Center (SunMC)

An element management system for monitoring and managing the Sun environment. Sun Management Center also integrates with the leading enterprise management software, including the Sun Storage Automated Diagnostic Environment, to provide customers with a unified management infrastructure. The base package of Sun Management Center is free and provides hardware monitoring. Advanced applications (add-ons) extend the monitoring capability of the base package.

Sun StorEdge Remote Response service

A remote support solution for Sun StorEdge series storage systems that proactively identifies operational anomalies to help prevent them from becoming business problems. Through around-the-clock monitoring, connectivity with Sun, and remote support, the Sun StorEdge Remote Response service helps maximize a storage system's availability.

suspend operation

In the context of data replication, an operation in which replication set or consistency group activity is temporarily stopped, and an internal bitmap tracks write operations to the volume rather than sending the write operations over the physical link to the secondary volume. This method tracks write operations that have not been remotely copied while access to the secondary peer is interrupted or impaired. The software uses this replication bitmap to reestablish data replication through an optimized update synchronization rather than through a complete volume-to-volume copy. See also Fast Start operation and resume operation.

switch fabric card (SFC)

In the Sun StorEdge 6920 system a board that provides the central switching function for the Data Services Platform (DSP).

synchronization

The act of aligning or making entries be equivalent at a specified point in time. (SNIA).

In the context of mirroring, see resilvering.

synchronous replication

A replication technique in which data must be committed to storage at both the primary site and the secondary site before a write to the primary volume is acknowledged. See also asynchronous replication.

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T

target

The system component that receives a SCSI I/O command. (SNIA)

A target in the Sun StorEdge 6920 system can be an initiator or logical unit number (LUN).

thin-scripting client

See remote scripting CLI client.

topology

A graphical depiction of a storage network or storage system.

tray

See storage tray.

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U

USB flash disk

In the Sun StorEdge 6920 system a disk connected to the Storage Service Processor that stores system characteristics for the Storage Service Processor and Data Services Platform (DSP). The disk connects to the USB port on the Storage Service Processor.

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V

virtual disk

A set of disk blocks presented to an operating environment as a range of consecutively numbered logical blocks with disk-like storage and I/O semantics. The virtual disk is the disk array object that most closely resembles a physical disk from the operating environment's viewpoint. (SNIA)

In the Sun StorEdge 6920 system, the system itself is the operating environment.

virtualization

The act of integrating one or more (back end) services or functions with additional (front end) functionality for the purpose of providing useful abstractions. Typically virtualization hides some of the back end complexity, or adds or integrates new functionality with existing back end services. Examples of virtualization are the aggregation of multiple instances of a service into one virtualized service, or to add security to an otherwise insecure service. Virtualization can be nested or applied to multiple layers of a system. (SNIA)

The Sun StorEdge 6920 system uses virtualization attributes to create and manage storage pools. See also concatenation and striping.

virtualization strategy

Selection of the technique used for virtualization of data across multiple virtual disks. See also concatenation and striping.

volume

A logically contiguous range of storage blocks allocated from a single pool and presented by a disk array as a logical unit number (LUN). A volume can span the physical devices that constitute the array, or it can be wholly contained within a single physical disk, depending on its virtualization strategy, size, and the internal array configuration. The array controller makes these details transparent to applications running on the attached server system.

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W

World Wide Name (WWN)

A unique identifier for a port, initiator, virtual disk, or volume, assigned by the system. The WWN of an object does not change throughout its lifetime and is never reused to name another object.

write order consistency

Preservation of write ordering across all volumes in a consistency group or in replication sets.

write ordering

The process by which write operations that are directed to the secondary volume occur in the same order as write operations to the primary volume.

WWN

See World Wide Name (WWN).

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Z

zone

A collection of Fibre Channel N_Ports and/or NL_Ports (that is, device ports) that are permitted to communicate with each other via the fabric. (SNIA)

zoning

A method of subdividing a storage area network (SAN) into disjoint zones, or subsets of nodes on the network. SAN nodes outside a zone are invisible to nodes within the zone. With switched SANs, traffic within each zone can be physically isolated from traffic outside the zone. (SNIA) See also zone.

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