Glossary - Hitachi VSP Gx00 series System Administrator Manual

Glossary

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2DC
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.
3DC
three-data-center. Refers to the local, intermediate, and remote sites, or data centers, in which
TrueCopy and Universal Replicator 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).
A
array
See disk array
audit log
Files that store a history of the operations performed from Device Manager - Storage Navigator and
the commands that the storage system received from hosts, and data encryption operations.
B
back-end director (BED)
The hardware component that controls the transfer of data between the drives and cache. A BED
feature consists of a pair of boards. A BED is also referred to as a disk board (DKB).
BED
See back-end director.
bind mode
In bind mode the Cache Residency Manager extents are used to hold read and write data for specific
extent(s) on volume(s). Data written to the Cache Residency Manager bind area is not destaged to
the drives. For bind mode, all targeted read and write data is transferred at host data transfer speed.
blade
A computer module, generally a single circuit board, used mostly in servers.
C
cache logical partition (CLPR)
Consists of virtual cache memory that is set up to be allocated to different hosts in contention for
cache memory.
Glossary
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 349