HP 200 HP StorageWorks 200 Storage Virtualization System owner's guide (AE071- - Page 65

Glossary

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Glossary ACP 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 and SVS200, 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 sum 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 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). ASE Application System Engineer. BC The HP StorageWorks Business Copy XP software program, which enables you to maintain up to nine internal copies of logical volumes on a disk array. 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. Continuous Access The HP StorageWorks Continuous Access XP program, which enables you to replicate data stored on a local disk array to a remote disk array. cache Very high speed memory that is used to speed I/O transaction time. All reads and writes to a disk array 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 200 Storage Virtualization System owner's guide 65

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Glossary
ACP
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 and SVS200, 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 sum 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 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).
ASE
Application System Engineer.
BC
The HP StorageWorks Business Copy XP software program,
which enables you to maintain up to nine internal copies of
logical volumes on a disk array.
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.
Continuous Access
The HP StorageWorks Continuous Access XP program, which
enables you to replicate data stored on a local disk array to a
remote disk array.
cache
Very high speed memory that is used to speed I/O transaction
time. All reads and writes to a disk array 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 200 Storage Virtualization System owner’s guide
65