HP StorageWorks XP12000 Disk Array owner's guide (AE002-96029, October 2006)

The benefit of cache memor y is that it speeds I/O throughput
to the application. The larger the cache size, the greater
the amount of data buffering that can occur and the greater
throughput to the applications.
XP arrays support a range of cache memory. In the event of
power loss, battery power holds up the contents of cache for
up to 36 hours.
CE Customer engineer.
channel adapter
(CHA)
The channel adapter (CHA) provides the interface between
the d isk array and the external host system. O ccasionally this
term is used synonymously with the term channel host interface
processor (CHIP).
channel host in-
terface processor
(CHIP)
Synonymous with the term channel adapter (CHA).
channel processor
(CHP)
The processors located on the channel adapter (C H A).
Synonymous with CHIP.
command device A volume on the disk array that accepts Continuous Access
or Business Copy control operations which are then executed
by the disk array.
control unit To organize the storage space attached to the D KC, you can
group similarly configured logical devices (LDEVs) with unique
control unit images (CUs). CUs are numbered sequentially. The
disk array supports a cer tain number of CUs, depending on
the disk array model. Each CU ca n m
anage multiple LDEVs.
Therefore, to uniquely identif
y a particular LDEV requires both
the CU number and the LDEV number.
CU Control unit.
CVS Custom volume size. C VS devices (OPEN-x CVS) are custom
volumes configured using array management software to
be smaller than normal fixed-size OPEN system volumes.
Synonymous with volume size customization (VSC).
disk adapter
(DKA)
Synonymous with the term ACP.
disk unit (DKU) The array hardware that houses the disk array physical disks.
disk controller
(DKC)
The array hardware that houses the channel adapters and
service processor (SVP).
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Glossary