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108 HP StorageWorks Disk Arrays XP128/XP1024: Owner’s Guide
BTU British thermal unit.
<Symbol font>×C Degrees centigrade/Celsius.
C-Track The HP StorageWorks Continuous Track XP software program, which
detects internal hardware component problems on a disk array and
automatically reports them to the HP STC.
CA The HP StorageWorks Continuous Access XP software program, which
enables you to create and maintain duplicate copies of the data stored on a
local disk array.
ca Cache.
cache Very high speed memory that is used to speed I/O transaction time. All
reads and writes to the XP array family are sent to the cache. The data is
buffered there until the transfer to/from physical disks (with slower data
throughput) is complete.
The benefit of cache memory is that it speeds I/O throughput to the
application. The larger the cache size, the greater amount of data buffering
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 allows the contents of the cache boards to survive for up to
48 hours.
CDE Common desktop environment.
CE Customer engineer.
CFW Cache fast write.
CH Channel.
channel adapter
(CHA)
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).
channel host
interface processor
(CHIP)
Synonymous with the term channel adapter (CHA).