HP StorageWorks XP12000 HP StorageWorks XP12000 Disk Array Owner's Guide (AE00 - Page 47

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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, 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 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 RAID6 array groups are made up of 8 HDDs (6D+2P). BC 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. C-Track The HP StorageWorks XP Continuous Track 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 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. The benefit of cache memory is that it speeds I/O throughput to the application. The larger the cache size, the greater the amount of data buffering that can occur and the greater throughput to the applications. XP arrays support a range of cache memory. In the event of power loss, battery power holds up the contents of cache for up to 36 hours. channel adapter (CHA) The channel adapter (CHA) provides the interface between the disk array and the external host system. Occasionally this term is used synonymously with the term channel host interface processor (CHIP). channel host Synonymous with the term channel adapter (CHA). interface processor (CHIP) XP12000 Disk Array Owner's Guide 47

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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, 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 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 RAID6 array groups are made up of 8
HDDs (6D+2P).
BC
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.
C-Track
The HP StorageWorks XP Continuous Track 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
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.
The benefit of cache memory is that it speeds I/O throughput to the application.
The larger the cache size, the greater the amount of data buffering that can occur
and the greater throughput to the applications.
XP arrays support a range of cache memory. In the event of power loss, battery
power holds up the contents of cache for up to 36 hours.
channel adapter
(CHA)
The channel adapter (CHA) provides the interface between the disk array and
the external host system. Occasionally this term is used synonymously with the
term channel host interface processor (CHIP).
channel host
interface processor
(CHIP)
Synonymous with the term channel adapter (CHA).
XP12000 Disk Array Owner's Guide
47