Compaq HSG80 - StorageWorks RAID Array Controller Spécifications télécharger pdf (Page 115)

4–35

Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide

An unpartitioned storage unit has more capacity than a partition that uses the whole

unit because each partition requires five blocks of administrative metadata. Thus, a

single disk unit that contains one partition can store n-5 blocks of user or application

data.

See “Guidelines for Partitioning Storagesets and Disk Drives,” page 4–35, for

information on manually partitioning a storageset or single-disk unit.

Guidelines for Partitioning Storagesets and

Disk Drives

Keep these points in mind as you plan your partitions:

■ You can create up to eight partitions per storageset or disk drive.

■ All of the partitions on the same storageset or disk drive must be addressed

through the same controller port. This ensures a transparent failover of devices

should one of the dual-redundant controllers fail.

■ Partitions cannot be combined into storagesets. For example, you cannot divide a

disk drive into three partitions, then combine those partitions into a RAIDset.

■ Partitioned storagesets cannot function in multiple-bus failover dual-redundant

configurations. Because they are not supported, you must delete your partitions

before configuring the controllers for multiple-bus failover.

■ Once you partition a container, you cannot unpartition it without reinitializing the

container.

■ Just as with storagesets, you do not have to assign unit numbers to partitions until

you are ready to use them.

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Compaq HSG80 - StorageWorks RAID Array Controller Spécifications Page 115