HP 200 HP StorageWorks 200 Storage Virtualization System site preparation guid - Page 49

Glossary

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Glossary ACP system 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 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 the system. system group A group of 4 or 8 physical hard disk drives (HDDs) installed in an XP system and assigned a common RAID level. RAID1 system groups consist of 4 (2D+2D) or 8 HDDs (4D+4D). RAID5 system groups include a parity disk but also consist of 4 (3D+1P) or 8 HDDs (7D+1P). All RAID6 system 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 the system. C-Track The HP StorageWorks Continuous Track XP software program, which detects internal hardware component problems on a system 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 system to a remote system. cache Very high speed memory that is used to speed I/O transaction time. All reads and writes to the XP system 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 systems 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. CE Customer engineer. channel adapter (CHA) The channel adapter (CHA) provides the interface between the system 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). channel processor The processors located on the channel adapter (CHA). Synonymous with CHIP. (CHP) command device A volume on the system that accepts Continuous Access or Business Copy control operations which are then executed by the system. HP StorageWorks 200 Storage Virtualization System site preparation guide 49

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Glossary
ACP
system 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 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 the system.
system group
A group of 4 or 8 physical hard disk drives (HDDs) installed in an XP system
and assigned a common RAID level. RAID1 system groups consist of 4 (2D+2D)
or 8 HDDs (4D+4D). RAID5 system groups include a parity disk but also consist
of 4 (3D+1P) or 8 HDDs (7D+1P). All RAID6 system 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 the system.
C-Track
The HP StorageWorks Continuous Track XP software program, which detects
internal hardware component problems on a system 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 system to a remote system.
cache
Very high speed memory that is used to speed I/O transaction time. All reads
and writes to the XP system 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 bene
fi
t 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 systems 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.
CE
Customer engineer.
channel adapter
(CHA)
The channel adapter (CHA) provides the interface between the system and the
external host system. Occasionally this term is used synonymously with the term
channel host interface processor (CHIP).
channel host in-
terface processor
(CHIP)
Synonymous with the term channel adapter (CHA).
channel processor
(CHP)
The processors located on the channel adapter (CHA). Synonymous with CHIP.
command device
A volume on the system that accepts Continuous Access or Business Copy
control operations which are then executed by the system.
HP StorageWorks 200 Storage Virtualization System site preparation guide
49