Specifications

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Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
Specify POLICY=BEST_PERFORMANCE to choose a replacement disk drive from
the spareset with the best performance. The controller attempts to select a disk on a
different port than existing mirrorset members. If there is more than one disk drive in
the spareset matching the best performance criteria, the controller selects the disk
drive that equals or exceeds the base member size of the mirrorset.
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.
Specify the READ_SOURCE=disk-name of 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.
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.
Examples
This example shows how to change the replacement policy of mirrorset MIRR1 to
BEST_FIT:
SET MIRR1 POLICY=BEST_FIT