HP StorageWorks Disk Array XP operating system configuration guide for Tru64 UNIX XP24000, XP12000, XP10000, v01 (A5951-96066, June 2007)

Glossary
AL Arbitrated loop.
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).
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 Disconnecting a failed unit or path and replacing it with an alternative unit or
path in order to continue functioning.
FC Fibre Channel.
FC-AL Fibre Channel arbitrated loop.
FCP Fibre Channel Protocol.
HBA Host bus adapter.
host mode Each port can be configured for a particular host type. These modes are
represented as two-digit hexadecimal numbers. For example, host mode 08
represents an HP-UX host.
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