Hitachi VSP G400 User Guide

command device
A dedicated logical volume used only by Command Control Interface and
Business Continuity Manager to interface with the storage system. Can be
shared by several hosts.
configuration definition file
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.
consistency group (CTG)
A group of copy relationships between virtual disks that are managed as a
single entity. A group of pairs on which copy operations are performed
simultaneously. When a CTG ID is specified for a specific operation, the
operation is performed simultaneously on all pairs belonging to the CTG
while keeping data consistency.
copy pair
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 just pair. A pair created by
Compatible FlashCopy
®
is called a relationship.
copy-on-write (COW)
Point-in-time snapshot copy of any data volume within a storage system.
Copy-on-write snapshots only store changed data blocks, therefore the
amount of storage capacity required for each copy is substantially smaller
than the source volume.
COW
See copy-on-write (COW).
COW Snapshot
Hitachi Copy-on-Write Snapshot
Glossary 301
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series

Hitachi VSP G400 Specifications

General

Brand	Hitachi
Model	VSP G400
Category	Storage
Language	English