HP StorageWorks XP12000 HP StorageWorks XP Disk Array Configuration Guide: Ope - Page 31

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Glossary array group CHA command device CU CVS emulation modes failover FC FCA FCP HBA host mode LDEV 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 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 OpenVMS 31

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Glossary
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.
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.
LDEV
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 OpenVMS
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