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

Glossary
ACP Array control processor. On some XP models, such as the
XP12000, the ACP handles the passing of data between the
cacheandthephysicaldrives. OnotherXPmodels,suchas
the XP10000 and SVS200, this function is handled by the d isk
adapter on the MIX board.
AL Arbitrated loop.
AL-PA Arbitrated loop physical address.
allocation The ratio of allocated storage capacity versus total capacity as
a percentage. “Allocated storage” refers to those LDEVs that
have paths assigned to them. The allocated storage capacity is
the s um of the storage of these LDEVs. Total capacity refers to
the sum of the capacity of all LDEVs on a disk array.
array group A group of 4 or 8 phys ical hard disk drives (HDDs) installed in
an XP disk array and assigned a common R AID level. R AID1
array groups consist of 4 (2D+2D) or 8 HDDs (4D+4D). RAID5
array groups include a parity disk but also consist of 4 (3D+1P)
or 8 HD D s (7D+1P). All RAID6 array groups are made up of
8 HDDs (6D+2P).
ASE Application Sy stem Engineer.
BC TheHPStorageWorksBusinessCopyXPsoftwareprogram,
which enables you to maintain up to nine internal copies of
logical volumes on a disk array.
C-Track The HP StorageW orks Continuous T rack XP software program,
which detects internal hardware component problems on a disk
array and automatically reports them to the HP STC.
Continuous Access TheHPStorageWorksContinuousAccessXPprogram,which
enables you to replicate data stored on a local disk array to a
remote disk array.
cache Ver y high speed memor y that is used to speed I/O transaction
time. All reads and writes to a disk array are sent to the ca che.
The data is buffered there until the transfer to/from physical
disks (with slower data throughput) is complete.
HP StorageWorks 200 Storage Virtualization System owner’s guide
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