HP XP20000/XP24000 Посібник з конфігурації - Сторінка 33

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HP XP20000/XP24000 Посібник з конфігурації

Glossary

AL-PA

array group

command device

CVS

emulation modes

failover

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