Glossary - HP StorageWorks XP12000 Site Prep Manual

Glossary

ACP
AL
AL-PA
allocation
array group
ASE
BC
C-Track
CA
cache
Array control processor. On some XP models, such as the
XP12000, the ACP handles the passing of data between the
cache and the physical drives. On other XP models, such as
the XP10000, this function is handled by the disk adapter on
the MIX board.
Arbitrated loop.
Arbitrated loop physical address.
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 sum of the storage of these LDEVs. Total capacity refers to
the sum of the capacity of all LDEVs on the disk array.
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 RAID6 array groups are made up of
8 HDDs (6D+2P).
Application System Engineer.
The HP StorageWorks Business Copy XP software program,
which enables you to maintain up to nine internal copies of
logical volumes on the disk array.
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.
The HP StorageWorks Continuous Access XP program, which
enables you to replicate data stored on a local disk array to a
remote disk array.
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.
HP StorageWorks XP12000 Disk Array
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