HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide: Tru64 UN - Page 33

Glossary

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Glossary AL-PA array group CHA command device CU CVS emulation modes failover FC FCA FC-AL FCP HBA Arbitrated loop physical address. 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). Channel Adapter: Front end PCBs in XP arrays responsible for communication to other devices, typically Hosts, though they are also involved in data exchange with external storage. A volume on the disk array that accepts XP Continuous Access Software or XP Business Copy Software control operations which are then executed by the disk array. Control Unit. Contains LDEVs and is approximately equivalent to SCSI Target ID. Custom volume size. CVS devices (OPEN-x CVS) are custom volumes configured using array management software to be smaller than normal fixed-size OPEN system volumes. Synonymous with volume size customization (VSC). OPEN-V is a CVS-based volume. The logical devices (LDEVs) associated with each RAID group are assigned an emulation mode that makes them operate like OPEN system disk drives. The emulation mode determines the size of an LDEV: OPEN-3: 2.46 GB OPEN-8: 7.38 GB OPEN-9: 7.42 GB OPEN-E: 13.56 GB OPEN-L: 36 GB OPEN-V: User-defined custom size Using an alternate unit or path instead of a failed unit or path in order to continue functioning. Fibre Channel. Fibre Channel Adapter. Fibre Channel arbitrated loop. Fibre Channel Protocol. Host bus adapter. XP Disk Array Configuration Guide for Tru64 UNIX 33

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Glossary
AL-PA
Arbitrated loop physical address.
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).
CHA
Channel Adapter: Front end PCBs in XP arrays responsible for communication
to other devices, typically Hosts, though they are also involved in data exchange
with external storage.
command device
A volume on the disk array that accepts XP Continuous Access Software or XP
Business Copy Software control operations which are then executed by the disk
array.
CU
Control Unit. Contains LDEVs and is approximately equivalent to SCSI Target ID.
CVS
Custom volume size. CVS devices (OPEN-x CVS) are custom volumes configured
using array management software to be smaller than normal fixed-size OPEN
system volumes. Synonymous with volume size customization (VSC). OPEN-V is
a CVS-based volume.
emulation modes
The logical devices (LDEVs) associated with each RAID group are assigned an
emulation mode that makes them operate like OPEN system disk drives. The
emulation mode determines the size of an LDEV:
OPEN-3: 2.46 GB
OPEN-8: 7.38 GB
OPEN-9: 7.42 GB
OPEN-E: 13.56 GB
OPEN-L: 36 GB
OPEN-V: User-defined custom size
failover
Using an alternate unit or path instead of a failed unit or path in order to continue
functioning.
FC
Fibre Channel.
FCA
Fibre Channel Adapter.
FC-AL
Fibre Channel arbitrated loop.
FCP
Fibre Channel Protocol.
HBA
Host bus adapter.
XP Disk Array Configuration Guide for Tru64 UNIX
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