two-data-center. Refers to the local and remote sites, or data centers, in which TrueCopy (TC) and Universal Replicator (UR) combine to form a remote replication configuration. In a 2DC configuration, data is copied from a TC primary volume at the local site to the UR master journal volume at an intermediate site, then replicated to the UR secondary volume at the remote site. Since this configuration side-steps the TC secondary volume at the intermediate site, the intermediate site is not considered a data center.
three-data-center. Refers to the local, intermediate, and remote sites, or data centers, in which TrueCopy (TC) and Universal Replicator (UR) combine to form a remote replication configuration. In a 3DC configuration, data is copied from a local site to an intermediate site and then to a remote site (3DC cascade configuration), or from a local site to two separate remote sites (3DC multi-target configuration).
active/non-optimized
active/optimized
The setting on a logical volume that determines whether hosts can read and/or write to the volume.
advanced file system
Advanced Encryption Standard
arbitrated loop
arbitrated-loop physical address
A logical device (LDEV) for which one or more host paths are defined.
A secondary path (port, target ID, LUN) to a logical volume, in addition to the primary path, that is used as a backup in case the primary path fails.
asymmetric logical unit access
Hitachi Adaptable Modular Storage
American National Standards Institute
allocation on use. Another name for Hitachi Dynamic Provisioning.
Another name for a RAID storage system.
All functions, paths, and drives controlled by one back-end module (BEM) feature (pair of boards). An array domain can contain a mix of volume types and RAID levels.
See RAID group.
Array Support Library
asynchronous
Performs multiple pairsplit tasks at a pre-determined time.
asynchronous transfer mode
Files that store a history of the operations performed from Device Manager - Storage Navigator and the service processor (SVP) and commands that the storage system received from hosts.
average
bit
bits per second
The hardware component that controls the transfer of data between the drives and cache. A BEM feature consists of a pair of boards. A BEM is also referred to as a disk blade (DKB).
buffer-to-buffer credit
business continuity
See back-end module (BEM).
backup module
block
bitmap
basic (power) supply
bus adapter
See consistency time (C/T).
cache
A cache extent is an area in cache reserved for use by an application. These areas can be allocated for different functions, including Virtual Partition Manager. One cache extent, also called a slot, is 512 LBAs (264 KB) for OPEN-V volumes and 128 LBAs (66 KB) for OPEN-x volumes.
A circuit board containing random-access memory (RAM) that is a component in the Hitachi Panama controller.
Virtual cache memory that is allocated to different hosts to prevent contention for cache memory.
The amount of data storage space available on a physical storage device, usually measured in bytes (MB, GB, TB, etc.).
In a 3DC cascade configuration for remote replication, data is copied from a local site to an intermediate site and then to a remote site using TrueCopy and Universal Replicator. See also 3DC. In a ShadowImage cascade configuration, two layers of secondary volumes can be defined for a single primary volume. Pairs created in the first and second layer are called cascaded pairs.
A ShadowImage function that allows a primary volume (P-VOL) to have up to nine secondary volumes (S-VOLs) in a layered configuration. The first cascade layer (L1) is the original ShadowImage pair with one P-VOL and up to three S-VOLs. The second cascade layer (L2) contains ShadowImage pairs in which the L1 S-VOLs are functioning as the P-VOLs of layer-2 ShadowImage pairs that can have up to two S-VOLs for each P-VOL. See also root volume, node volume, leaf volume, layer-1 (L1) pair, and layer-2 (L2) pair.
A ShadowImage pair in a cascade configuration. See cascade function.
copy after write
cylinder-cylinder
cylinder-cylinder, head-head
Command Control Interface
certificate encryption key
cache fast write
See consistency group (CTG).
Another name for a front-end module. See front-end module (FEM).
challenge handshake authentication protocol
channel blade. Another name for a front-end module (FEM).
common internet file system
cluster
command line interface
cache logical partition
control memory
cache memory adapter
cache memory module
A dedicated logical volume used only by Command Control Interface to interface with the storage system. Can be shared by several hosts.
A text file that defines the configuration, parameters, and options of Command Control Interface (CCI) operations. It also defines the connected hosts and the volumes and groups known to the CCI instance.
A group of pairs on which copy operations are performed simultaneously; the pairs' status changes at the same time. See also extended consistency group (EXCTG).
A time stamp to indicate how close the secondary volume is to the primary volume of a copy pair. C/T also shows the time stamp of a journal group and extended consistency group.
A logical subsystem in a Hitachi Panama storage system. The Hitachi Panama is configured with one CU image for each 256 logical volumes to provide up to 255 CU images per storage system.
The component in a storage system that manages all storage functions. The controller is analogous to a computer and contains processors, I/O devices, RAM, power supplies, cooling fans, and other subcomponents to support the operation of the storage system.
The hardware component that houses the controller components of the Hitachi Panama storage system, including the front-end modules, cache memory, switches, and back-end modules.
A pair of volumes in which one volume contains original data and the other volume contains the copy of the original. Copy operations can be synchronous or asynchronous, and the volumes of the copy pair can be located in the same storage system (local copy) or in different storage systems (remote copy). A copy pair can also be called a volume pair or simply a pair.
copy on write
cyclic redundancy checking
See consistency time (C/T).
See consistency group (CTG).
command tag queuing
control unit
The synchronization of the volumes in a copy pair. When the data on the secondary volume (S-VOL) is identical to the data on the primary volume (P-VOL), the data on the S-VOL is current. When the data on the S-VOL is not identical to the data on the P-VOL, the data on the S-VOL is not current.
A custom-size volume whose size is defined by the user using Hitachi Virtual LUN.
See custom volume (CV).
custom volume size
clustered version of XFS file system
cylinder
Indicates the differential data (updated by write I/Os) in a volume of a split or suspended copy pair. The primary and secondary volumes each have their own cylinder bitmap. When the pair is resynchronized, the cylinder bitmaps are merged, and the differential data is copied to the secondary volume.
delimiter
When the data on the secondary volume is identical to the data on the primary volume.
A physical data storage device that can be a hard disk drive (HDD), flash drive (also called a solid-state device), or a flash module drive (FMD).
The policies, processes, practices, services, and tools used to align the business value of data with the most appropriate and cost-effective storage infrastructure from the time data is created through its final disposition.
The physical paths used by primary storage systems to communicate with secondary storage systems in a remote replication environment.
One or more logical volumes designated to temporarily store original data. When a snapshot is taken of a primary volume, the data pool is used if a data block in the primary volume is to be updated. The original snapshot of the volume is maintained by storing the to-be-changed data blocks in the data pool.
database
disk drive box
data center
data encryption key
A disaster recovery solution in which TrueCopy and Universal Replicator systems are configured to provide a quick recovery using only differential data stored at an intermediate site.
device
A physical or logical unit with a specific function.
Type of logical volume. The device emulation type of volumes on the Hitachi Panama is OPEN-V.
The factory model name for the Hitachi Thunder 9500V storage system.
The factory model name for the Hitachi TagmaStore® Adaptable Modular Storage and Workgroup Modular Storage arrays.
The factory model name for the Hitachi Adaptable Modular Storage 2000 storage system.
Changed data in the primary volume not yet reflected in the secondary volume of a copy pair.
An exclusive volume for storing replication data when the storage system is powered down. The DM-LU is hidden from the host.
A set of procedures to recover critical application data and processing after a disaster or other failure.
Disk array, or just array, is another name for a RAID storage system.
Another name for a back-end module. See back-end module (BEM).
Another name for the controller box. The term “DKC” is also used to refer to the entire storage system.
disk blade. Another name for a back-end module (BEM).
See disk controller (DKC).
disk controller main. Refers to the microcode for the Hitachi Panama storage system.
disk processor. Refers to the microprocessors on the back-end module features of the Hitachi Panama.
See data lifecycle management (DLM).
See differential management logical unit (DM-LU).
Dynamic Multi Pathing
Hitachi Dynamic Provisioning
Dynamic Provisioning-virtual volume. A virtual volume with no physical storage space used by Dynamic Provisioning.
The hardware component of the Hitachi Panama that contains data drives and no controller components. A drive tray can also be called a drive box.
Hitachi Data Retention Utility
A collection of data that is saved to a file when an error or crash occurs. The data is used by support personnel to determine the cause of the error or crash.
An approach to managing storage in which capacity is removed from the available pool when data is actually written to disk. Dynamic provisioning is also referred to as thin provisioning.
error code
entry control block; Electronic Code Book
electromagnetic interference
environment
end of file; end of field
emergency power-off
error recovery procedure
external volume group
external
A port that is configured to be connected to an external storage system for Universal Volume Manager operations.
A logical volume whose data resides on drives that are physically located outside the Hitachi Panama storage system.
format/message
firmware
The process of switching operations from the secondary path or host back to the primary path or host, after the primary path or host has recovered from failure. See also failover.
The process of switching operations from the primary path or host to a secondary path or host when the primary path or host fails. See also failback.
fixed-block architecture
flash module drive (FMD) box
fibre channel
fibre-channel arbitrated loop
fibre-channel adapter
fibre-channel internet protocol
fibre-channel protocol
fibre-channel security protocol
See front-end module (FEM).
A data drive that is a solid-state memory device instead of a rotating hard disk drive. A flash drive can also be called a solid-state drive (SSD).
A high-speed data drive that includes multiple flash memory modules (solid-state drives) on a single PCB.
flash module drive
The amount of storage space (in bytes) that is available for use by the host systems.
The hardware component that processes channel commands from hosts and manages host access to cache. A FEM is also referred to as a channel blade (CHB).
fast-wide differential
gigabit
gigabits per second
group ID
gigabit link module
graphical user interface
gateway for unified management. Another name for the maintenance utility.
host logical unit
Hardware Assisted Resilient Data
hardware
high availability
High Availability Cluster Multi-Processing
host bus adapter
Hitachi Command Suite
head
hard disk drive
Hitachi Dynamic Link Manager
Hitachi Dynamic Provisioning
Hitachi Data Systems
Hitachi Dynamic Tiering software
Hitachi Device Manager software
host group
Hitachi Global Link Availability Manager
head-head
hold-error
Factory model name for the Hitachi Unified Storage VM storage system.
Factory model name for the Hitachi Panama storage system.
Factory model name for the Hitachi Panama G600 storage system.
Factory model name for the Hitachi Panama G400 storage system.
Factory model name for the Hitachi Panama G200 storage system.
Factory model name for the Hitachi Panama G800 storage system.
See host mode option.
Hitachi Open Multi-RAID Coupling Feature. Another name for Hitachi ShadowImage®.
Hitachi Open Remote Copy. Another name for Hitachi TrueCopy®.
Hitachi Open Remote Copy Manager. Another name for Command Control Interface.
The process of switching operations from one host to another host when the primary host fails.
A group of hosts of the same operating system platform.
Operational modes for the ports on the Hitachi Panama. The host modes provide enhanced compatibility with supported host platforms.
Additional options for the ports on the Hitachi Panama storage systems. The HMOs provide enhanced functionality for host software and middleware.
Hitachi Protection Manager
Hitachi Provisioning Manager
Hitachi Replication Manager software
host storage domain. See host group.
Hitachi Thin Image
Hitachi Tuning Manager
Hitachi Tuning Manager
Hitachi Tiered Storage Manager
Hitachi Universal Replicator
high-water mark
See intermediate site (I-site).
integrated drive electronics
internet fibre-channel protocol
internet information service
initial microcode load; initial microprogram load
initial microprogram load
The original data volume and its copy are located in the same storage system. ShadowImage in-system replication provides duplication of logical volumes; Thin Image in-system replication provides "snapshots" of logical volumes that are stored and managed as virtual volumes (V-VOLs). See also remote replication.
inch
An initial copy operation is performed when a copy pair is created. Data on the primary volume is copied to the secondary volume.
interval
The hardware option that connects two control chassis. Two sets of this option are required for the high-performance model.
A site that functions as both a TrueCopy Synchronous secondary site and a Universal Replicator primary site in a 3-data-center (3DC) cascading configuration.
A logical volume whose data resides on drives that are physically located within the storage system. See also external volume.
input/output
I/Os per second
internetwork operating system
internet protocol
initial program load
inter-switch link
internet storage name service
Journaled File System
journal
journal group
In a Universal Replicator system, journal groups manage data consistency between multiple primary volumes and secondary volumes. See also consistency group (CG, CTG).
A volume that records and stores a log of all events that take place in another volume. In the event of a system crash, the journal volume logs are used to restore lost data and maintain data integrity. In Universal Replicator, differential data is held in journal volumes on until it is copied to the S-VOL.
Java Runtime Environment
Java Virtual Machine
Java Web Start
kilobyte
kilobit
kilobits per second
key encryption key
A server that manages encryption keys. On the Hitachi Panama, users can back up and restore encryption keys on a key management server that complies with the Key Management Interoperability Protocol (KMIP).
Two mathematically-related cryptographic keys: a private key and its associated public key.
key management interoperability protocol
See layer-1 (L1) pair.
See layer-2 (L2) pair.
In a ShadowImage cascade configuration, a layer-1 pair consists of a primary volume and secondary volume in the first cascade layer. An L1 primary volume can be paired with up to three L1 secondary volumes. See also cascade configuration.
In a ShadowImage cascade configuration, a layer-2 (L2) pair consists of a primary volume and secondary volume in the second cascade layer. An L2 primary volume can be paired with up to two L2 secondary volumes. See also cascade configuration.
logical block address
logical control unit
local directory; logical device
lightweight directory access protocol
logical device
See logical disk controller (LDKC).
Logical Disk Manager
A level-2 secondary volume in a ShadowImage cascade configuration. The primary volume of a layer-2 pair is called a node volume. See also cascade configuration.
light-emitting diode
line feed
A specific set of characters that unlocks an application and allows it to be used.
loop initialization primitive
local memory
location
See in-system replication.
See primary site.
A storage system at a local (primary) site that contains primary volumes of remote replication pairs. The local storage system is configured to send remote I/Os to the storage systems at the remote (secondary) site, called remote storage systems, that contain the secondary volumes of the remote replication pairs. See also remote storage system.
An individual logical data volume (on multiple drives in a RAID configuration) in the storage system. An LDEV may or may not contain any data and may or may not be defined to any hosts. Each LDEV has a unique identifier, or address, within the storage system that is composed of the logical disk controller (LDKC) number, control unit (CU) number, and LDEV number. The LDEV IDs within a storage system do not change.An LDEV formatted for use by open-system hosts is called a logical unit (LU).
A group of 255 control unit (CU) images in the Hitachi Panama storage system that is controlled by a virtual (logical) storage system within the single physical storage system.
A subset of a system's hardware resources that is virtualized as a separate system. For a storage system, logical partitioning can be applied to cache memory and/or storage capacity.
A logical volume (for example, OPEN-V) that is configured for use by open-systems hosts.
The path between an open-systems host and a logical unit.
See volume.
Logical Storage Manager
logical unit
logical unit number
Hitachi LUN Manager
logical volume
Logical Volume Manager; logical volume management
master journal
See primary site.
The computer system that is used to perform Device Manager - Storage Navigator operations on the Hitachi Panama storage system.
Holds differential data on the primary Universal Replicator system until it is copied to the restore journal (R-JNL) on the secondary system. See also restore journal (R-JNL).
maximum
megabyte
megabits per second
See local storage system.
master directory block
message information block
migration
minute; minimum
In Universal Replicator, each pair relationship in and between journal groups is called a "mirror". Each pair is assigned a mirror ID when it is created. The mirror ID identifies individual pair relationships between journal groups.
Maintenance Manual
microprocessor
microprocessor unit
maximum physical extents
magnetoresistive
Microsoft Failover Cluster
memory switch
mirror unit
A performance and fault-tolerant technique that uses more than one physical connection between the storage system and host system. Also called multipath I/O.
NetBackup
network file system
network interface card
number
A level-2 primary volume in a ShadowImage cascade configuration. The secondary volume of a layer-2 pair is called a leaf volume. See also cascade configuration.
A port on which host processing has low priority. Nonprioritized ports are connected to low-priority host adapters.
Hitachi TagmaStore® Network Storage Controller
network time protocol
number
nonvolatile storage
Oracle call interface
Object Data Manager
open fibre control
online transaction processing
A logical unit (LU) of user-defined size for use by open-systems hosts.
operating system
open-systems interconnection
open-to-open
point-to-point
See primary site.
See primary volume (P-VOL).
physical address
Two logical volumes in a replication relationship in which one volume contains original data to be copied and the other volume contains the copy of the original data. The copy operations can be synchronous or asynchronous, and the pair volumes can be located in the same storage system (in-system replication) or in different storage systems (remote replication).
Indicates the condition of a copy pair. A pair must have a specific status for specific operations. When a pair operation completes, the status of the pair changes to a new status determined by the type of operation.
See RAID group.
The ability of a host to switch from using the primary path to a logical volume to the secondary path to the volume when the primary path fails. Path failover ensures continuous host access to the volume in the event the primary path fails. See also alternate path and failback.
petabyte
power control interface; peripheral component interconnect
power distribution box
physical device
Product Documentation Library
power distribution panel
power distribution unit; protocol data unit
Hitachi Performance Monitor
parity group. See RAID group.
See device.
point-in-time
A copy or snapshot of a volume or set of volumes at a specific point in time. A point-in-time copy can be used for backup or mirroring application to run concurrently with the system.
A set of volumes that are reserved for storing Hitachi Thin Image data or Dynamic Provisioning write data.
A logical volume that is reserved for storing snapshot data for Hitachi Thin Image operations or write data for Dynamic Provisioning.
Type of port (for example, external).
A group of four ports that have the same port mode.
The operational mode of a fibre-channel port. The three port modes are standard, high-speed, and initiator/external MIX.
program product; physical partition
The physical location of a storage system that contains original data to be replicated and that is connected to one or more storage systems at the remote or secondary site via remote copy connections. A primary site can also be called a "main site" or "local site". The term "primary site" is also used for host failover operations. In that case, the primary site is the location of the host computer on which the production applications are running, and the secondary site is the location of the host on which the backup applications run when the applications at the primary site have failed.
The volume in a copy pair that contains the original data to be replicated. The data on the P-VOL is duplicated synchronously or asynchronously on the secondary volume (S-VOL). See also secondary volume (S-VOL).
A port on which host processing has high priority. Prioritized ports are connected to high-priority host adapters.
A licensed software product for the Hitachi Panama storage system, for example, Dynamic Provisioning, TrueCopy, Encryption License Key.
power supply
physical volume
Query Security Attributes
The quick format feature in Hitachi Virtual LUN in which the formatting of the internal volumes is done in the background. This allows system configuration (such as defining a path or creating a TrueCopy pair) before the formatting is completed. To execute quick formatting, the volumes must be in blocked status.
A reverse resynchronization in which no data is actually copied: the primary and secondary volumes are swapped.
A split operation in which the pair becomes split immediately before the differential data is copied to the secondary volume (S-VOL). Any remaining differential data is copied to the S-VOL in the background. The benefit is that the S-VOL becomes immediately available for read and write I/O.
restore journal
remote service information message
remote site (used for Universal Replicator)
read/write
read/write
redundant array of inexpensive disks
A redundant array of independent drives (RAID) that have the same capacity and are treated as one group for data storage and recovery. A RAID group contains both user data and parity information, which allows the user data to be accessed in the event that one or more of the drives within the RAID group are not available. The RAID level of a RAID group determines the number of data drives and parity drives and how the data is "striped" across the drives. For RAID1, user data is duplicated within the RAID group, so there is no parity data for RAID1 RAID groups. A RAID group can also be called an array group or a parity group.
The type of RAID implementation. RAID levels include RAID0, RAID1, RAID2, RAID3, RAID4, RAID5 and RAID6.
Factory model name for the Hitachi TagmaStore® Universal Storage Platform and Hitachi TagmaStore® Network Storage Controller storage systems.
Factory model name for the Hitachi Universal Storage Platform V/VM storage system.
Factory model name for the Hitachi Virtual Storage Platform storage system.
Factory model name for the Hitachi Virtual Storage Platform G1000 storage system.
role-based access control
reference code (of a service information message)
read
See remote replication.
The physical paths that connect a storage system at the primary site to a storage system at the secondary site. Also called data path.
Data replication configuration in which the storage system that contains the original data is at a local site and the storage system that contains the copy of the original data is at a remote site. TrueCopy and Universal Replicator provide remote replication. See also in-system replication.
See secondary site.
A storage system at a remote (secondary) site that contains secondary volumes of remote replication pairs. The remote storage system is configured to receive remote I/Os from one or more local (primary) storage systems at the local (primary) site. See also local storage system.
A type of resource group to which resources of a virtual storage machine in a Panama system belong, if those resources have not been added to another resource group. There are two types of resource pools: the resource pool on the default virtual storage machine and the resource pool that is created automatically for each virtual storage machine that you create on a Panama system.
The secondary or remote journal volume. A restore journal holds differential data on the secondary Universal Replicator system until the data is copied to the secondary volume (S-VOL). See also master journal (MJNL).
resynchronize
remote I/O
RAID Manager. Another name for Command Control Interface.
Remote Method Invocation
random
A level-1 primary volume in a ShadowImage cascade configuration. The secondary volume of a layer-1 pair is called a node volume. See also cascade configuration.
recovery point objective
registered state-change notification
reserved
real-time clock
recovery time objective
serial number
See secondary volume (S-VOL).
serial number
software
System Administration Manager
storage control
state change pending
symbolic device address
second
The physical location of the storage system that contains the secondary volumes of remote replication pairs at the primary site. The storage system at the secondary site is connected to the storage system at the primary site by means of the remote copy connections. The secondary site can also be called the "remote site". See also primary site.
The volume in a copy pair that is the copy of the original data on the primary volume (P-VOL). See also primary volume (P-VOL).
sequential
A set of host adapters managed as a group. All host adapters in an SPM group must be of the same priority. Prioritized WWNs and nonprioritized WWNs cannot be mixed in the same SPM group.
Messages generated by the Hitachi Panama storage system when it detects an error or service requirement. SIMs are reported to hosts and displayed by Device Manager - Storage Navigator.
The component inside a Hitachi Panama storage system that hosts the Hitachi Device Manager - Storage Navigator software and is used for configuration and maintenance of the storage system.
Applies to service information messages (SIMs) and Hitachi Device Manager - Storage Navigator error codes.
small form-factor pluggable
A volume that is being used by more than one replication function. For example, a volume that is the primary volume of a TrueCopy pair and the primary volume of a ShadowImage pair is a shared volume.
Volume Shredder
See volume shredding.
Hitachi ShadowImage®
An area of cache memory that is used to store updated data for later integration into the copied data.
service information message
Generally refers to the storage capacity of a memory module or cache. Not usually used for storage of data on disk or flash drives.
SuSE Linux Enterprise Server
sleep
shared memory
shared memory adapter
server message block
System Management Information Tool
system management unit
serial number
A point-in-time virtual copy of a Hitachi Thin Image primary volume (P-VOL). The snapshot is maintained when the P-VOL is updated by storing pre-updated data (snapshot data) in a data pool.
simple network management protocol
system option mode
Generally refers to the storage capacity of a data drive (for example, hard disk drive, flash drive).
Hitachi Server Priority Manager
Hitachi Storage Replication Adapter
Storage Replication Manager
sense byte
solid-state drive. Another name for a flash drive.
storage subsystem identifier
secure socket layer
In ShadowImage, a typical pair split operation in which any remaining differential data from the P-VOL is copied to the S-VOL and then the pair is split.
See cluster.
See tiered storage.
Storage Virtualization Operating System
See service processor (SVP).
switch; short wavelength
synchronize; synchronous
The file on the service processor that contains information released to both the syslog and audit log files and information released only to the syslog file.
Additional operational parameters for the Hitachi Panama that enable the storage system to be tailored to unique customer operating requirements.
Hitachi TrueCopy®
target
threshold
Hitachi Thin Image
target ID
A layered structure of performance levels, or tiers, that match data access requirements with the appropriate performance tiers.
The aggregate amount of storage space in a data storage system.
track
tab-separated values
unit address
unit control block
user datagram protocol
UNIX file system
unit information module
An LDEV for which no host paths are assigned.
An operation that copies differential data on the primary volume of a copy pair to the secondary volume. Update copy operations are performed in response to write I/Os on the primary volume after the initial copy operation is completed.
uninterruptible power supply
Hitachi Universal Replicator
Hitachi TagmaStore® Universal Storage Platform
Hitachi Universal Storage Platform V/VM
Hitachi Universal Storage Platform VM
Hitachi TagmaStore® Universal Storage Platform and Hitachi TagmaStore® Network Storage Controller
Universal Time
Universal Time-coordinated
Hitachi Universal Volume Manager
version
See virtual volume (V-VOL).
Contains the pool management block and pool association information for Dynamic Provisioning, Dynamic Tiering, and Thin Image operations. The V-VOL management area is created automatically when additional shared memory is installed.
See virtual device (VDEV).
virtual file access
volume information block
A group of logical devices (LDEVs) in a RAID group. A VDEV typically consists of some fixed volumes (FVs) and some free space. The number of fixed volumes is determined by the RAID level.
A custom-size volume whose size is defined by the user using Virtual LUN. Also called a custom volume (CV).
A logical volume in a storage system that has no physical storage space. Hitachi Thin Image uses V-VOLs as secondary volumes of copy pairs. In Dynamic Provisioning, V-VOLs are referred to as DP-VOLs.
Hitachi Virtual LUN
volume migration; volume manager
volume management area
volume
volume ID
A logical device (LDEV) that has been defined to one or more hosts as a single data storage unit. An open-systems volume is called a logical unit (LU).
See copy pair.
Deleting the user data on a volume by overwriting all data in the volume with dummy data.
virtual parity group
Hitachi Virtual Partition Manager
Hitachi Virtual Storage Platform
Hitachi Virtual Storage Platform G1000
Microsoft Volume Shadow Copy Service
wavelength division multiplexing
Hitachi Workgroup Modular Storage
write
The order of write I/Os to the primary volume (P-VOL) of a copy pair. The data on the secondary volume (S-VOL) is updated in the same order as on the P-VOL, particularly when there are multiple write operations in one update cycle. This feature maintains data consistency at the secondary volume. Update records are sorted in the cache at the remote system to ensure proper write sequencing.
workstation
worldwide name
worldwide port name
IRIX extended file system
extended logical volume manager
The number 0 (zero). A zero-formatting operation is one that writes zero data to the entire data drive area.
A formatting operation that writes zero data to the entire data drive area.