Glossary - HP StorageWorks XP1024 - Disk Array Owner's Manual

ACP
AL
AL-PA
allocation
array group
ASE
BC

Glossary

Array control processor. The ACP handles the passing of data between the
cache and the physical drives held in the DKUs. ACPs work in pairs,
providing a total of eight SCSI buses. Each SCSI bus associated with one
ACP is paired with a SCSI bus on the other ACP pair element. In the event
of an ACP failure, the redundant ACP takes control. Both ACPs work
together sharing the load.
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 2D+2D array groups are
made up of 4 HDDs. A RAID1 4D+4D group is two 4 HDD array groups
concatenated together. RAID5 array groups are made up of 4 or 8 HDDs,
depending on whether they are RAID5 3D+1P or RAID5 7D+1P,
respectively. 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.
Glossary
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