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

Glossary
ACP Array control processor. On some XP models, such as the
XP12000, the ACP handles the passing of d ata between the
cacheandthephysicaldrives. OnotherXPmodels,suchas
the XP10000, this function is handled by the disk 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 the disk array.
array group A group of 4 or 8 physical hard disk drives (HDDs) installed in
an XP disk array and assigned a common RAID level. RAID1
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 HDDs (7D+1P) . All R AID6 array groups are made up of
8 HDDs (6D+2P) .
ASE Application System Engineer.
BC TheHPStorageWorksBusinessCopyXPsoftwareprogram,
which enables you to maintain up to nine internal copies of
logical volumes on the disk array.
C-Track The HP StorageW orks Continuous Track XP software program,
which detects internal hardware component problems on a disk
array and automatically reports them to the HP STC.
Continuous Access The HP StorageWorks Continuous Access program, which
enables you to replicate data stored on a local disk array to a
remote disk array.
cache Ver y 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 buffere d there until the transfer to/from
physical disks (with slower d a ta throughput) is complete.
HP StorageWorks XP12000 Disk Array
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