Compaq HSG80 - StorageWorks RAID Array Controller Especificações descarregar pdf (Página 120)

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Planning Storagesets

■ COPY=FAST allocates more resources to reconstructing the replacement disk

drive, which may reduce the subsystem’s overall performance during the

reconstruction task.

Read Source

Specify the read source to determine how the controller reads data from the members

of a mirrorset:

■ READ_SOURCE=LEAST_BUSY (default) forces the controller to read data

from the “normal” or operational member that has the least-busy work queue. If

multiple disks have equally short queues, the controller queries normal local

disks for each read request as it would when

READ_SOURCE=ROUND_ROBIN is specified. If no normal local disk exists,

then the controller will query any remote disks if available.

■ READ_SOURCE=ROUND_ROBIN forces the controller to read data

sequentially from all “normal” or operational members in a mirrorset. For

example, in a four-member mirrorset (A, B, C, and D), the controller reads from

A, then B, then C, then D, then A, then B, and so forth. No preference is given to

any member. If no normal local disk exists, then the controller will query any

remote disks if available.

■ READ_SOURCE=DISKnnnnn forces the controller to always read data from a

particular “normal” or operational member. If the specified member fails, the

controller reads from the least busy member.

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