HP XP P9500 Storage - Manual (Page 119)

Glossary
This glossary defines the special terms used in this document. Click the letter links below
to navigate.
2DC two-data-center. Refers to the local and remote sites, or data centers, in which Continuous Access
Synchronous (Cnt Ac-S) and Continuous Access Journal (Cnt Ac-J) combine to form a remote
replication configuration.
In a 2DC configuration, data is copied from a Cnt Ac-S primary volume at the local site to the
Cnt Ac-J master journal volume at an intermediate site, then replicated to the Cnt Ac-J secondary
volume at the remote site. Since this configuration side-steps the Cnt Ac-S 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
Cnt Ac-S and Cnt Ac-J combine to form a remote replication configuration. A 3DC configuration
can also combine three Cnt Ac-J sites.
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 remote sites (3DC multi-target
configuration).
alternate path 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.
array Another name for a RAID storage system.
array controller The computer inside a RAID storage system that hosts the Remote Web Console software and is
used by service personnel for configuration and maintenance of the storage system.
array group See RAID group.
async asynchronous
at-time split Operation that allows multiple pairsplit operations to be performed at a pre-determined time.
audit log Files that store a history of the operations performed from Remote Web Console and the service
processor (SVP), commands that the storage system received from hosts, and data encryption
operations.
base emulation
type Emulation type that is set when drives are installed. Determines the device emulation types that
can be set in the RAID group.
BC business continuity
blade A computer module, generally a single circuit board, used mostly in servers.
BLK, blk block
bmp bitmap
C/T See consistency time (C/T).
ca cache
cache logical
partition (CLPR) Consists of virtual cache memory that is set up to be allocated to different hosts in contention for
cache memory.
CAJ Continuous Access Journal
capacity The amount of data storage space available on a physical storage device, usually measured in
bytes (MB, GB, TB, etc.).
cascade
configuration 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 Continuous Access Synchronous and Continuous
Access Journal. See also 3DC.
In a Business Copy 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.
cascade function A Business Copy function for open systems 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 Business Copy pair with one P-VOL and up to three S-VOLs. The second cascade layer
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