HP XP20000/XP24000 Konfigurationshandbuch - Seite 33

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HP XP20000/XP24000 Konfigurationshandbuch

Glossary

AL-PA
array group
command device
CU
CVS
emulation modes
failover
FC
FCA
FC-AL
FCP
HBA
host mode
LDEV
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).
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.
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.
Logical device. An LDEV is created when a RAID group is carved into pieces
according to the selected host emulation mode (that is, OPEN-3, OPEN-8,
XP Disk Array Configuration Guide for Linux
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