HP StorageWorks XP12000 - Disk Array Owner's Manual page 74

CE
channel adapter
(CHA)
channel host in-
terface processor
(CHIP)
channel processor
(CHP)
command device
control unit
CU
CVS
disk adapter
(DKA)
disk unit (DKU)
disk controller
(DKC)
74
Glossary
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.
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.
Customer engineer.
The channel adapter (CHA) provides the interface between
the disk array and the external host system. Occasionally this
term is used synonymously with the term channel host interface
processor (CHIP).
Synonymous with the term channel adapter (CHA).
The processors located on the channel adapter (CHA).
Synonymous with CHIP.
A volume on the disk array that accepts Continuous Access
or Business Copy control operations which are then executed
by the disk array.
To organize the storage space attached to the DKC, you can
group similarly configured logical devices (LDEVs) with unique
control unit images (CUs). CUs are numbered sequentially. The
disk array supports a certain number of CUs, depending on
the disk array model. Each CU can manage multiple LDEVs.
Therefore, to uniquely identify a particular LDEV requires both
the CU number and the LDEV number.
Control unit.
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).
Synonymous with the term ACP.
The array hardware that houses the disk array physical disks.
The array hardware that houses the channel adapters and
service processor (SVP).