Compaq HSZ80 manual 116CLI Commands, SET MIRR1 POLICY=BESTFIT

5–116CLI Commands

Specify NOPOLICY to prevent the controller from automatically replacing a failed disk device. The mirrorset operates in a reduced state until a POLICY=BEST_FIT or POLICY=BEST_PERFORMANCE is selected, or a member is manually placed in the mirrorset.

READ_SOURCE=disk-name

READ_SOURCE=LEAST_BUSY (Default)

READ_SOURCE=ROUND_ROBIN

Selects the mirrorset member used by the controller to satisfy a read request. A member with REMOTE set may be selected.

Specify the READ_SOURCE=disk-nameof a specific member to which you want the controller to direct all read requests. If the member fails out of the mirrorset, the controller selects the first normal member it finds to satisfy its read requests.

Specify READ_SOURCE=LEAST_BUSY to direct read requests to the mirrorset member with the least amount of work in its queue. If multiple members have equally short queues, the controller queries these members 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 the remote disks.

Specify READ_SOURCE=ROUND_ROBIN to sequentially direct read requests to each mirrorset member. The controller equally queries all normal members for each read request. If no normal local disk exists, then the controller will query the remote disks.

Examples

This example shows how to change the replacement policy of mirrorset MIRR1 to BEST_FIT:

SET MIRR1 POLICY=BEST_FIT