Hp LUN Configuration Manager XP Software Manuel d'utilisateur télécharger pdf (Page 15)

Introduction 15

Important terms and concepts

You should be familiar with the following terms and concepts:

• controller

The disk array has one controller which controls data access and

storage operations. The disk array controller supports OPEN-

emulation modes.

• CU (control unit)

Each CU controls up to 256 LDEVs (XP256) or 512 LDEVs (XP512).

The CUs are numbered sequentially from 0 to E.

• LDEV (logical device)

An LDEV results when a RAID group is divided into parts according

to the emulation mode selection (OPEN-

x). The number of resulting

LDEVs depends upon the selected emulation mode.

• parity group

A parity group is a set of hard disk drives that have the same capacity

and are treated as one group. For example, a parity group of 18-GB

disk drives in a RAID5 configuration consists of four disk drives

(three data and one parity).

•volume

An LDEV can also be called a volume. The LDEV ID is internal to the

disk array and is not related to the volume serial number (volser) or

LUN number.

•path

A SCSI or Fibre Channel port ID, a SCSI target ID (TID), and a LUN

number.

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Hp LUN Configuration Manager XP Software Manuel d'utilisateur Page 15