HP StorageWorks 200 Storage Virtualization System owner's guide (AE071-96004, October 2006)

The benefit of cache memory 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.
The SVS200 supports a range of cache memor y. In the event
of power loss, bat tery power hold s 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. Occasionally 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 (CHA).
Synonymous with CHIP.
command device A volume on the d isk 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 at tached to the DKC, you c an
group similarly configured logical devices (LDEVs) with unique
control unit images (CUs). CUs are numbere d sequentially. The
disk array supports a certain number of CUs, depending on
the disk array mod el. Each CU can m
anage multiple LDEVs.
Therefore, to uniquely identif
y a particular LD EV requires both
the CU number and the LDEV number.
CU Control unit.
CVS Custom volume size. CVS 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) Disk array h ardware that houses physical disk s.
disk controller
(DKC)
Hardware that houses the channel adapters and service
processor (SVP).
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Glossary