HP Array Controller HSG V8.7 Software - Manual (Page 396)

B–124 HSG80 User’s Guide
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
This example shows how to remove member DISK30000 from
mirrorset MIRR1 created above. If the mirrorset has a replacement
policy and an acceptable disk drive is in the spareset, the controller
automatically adds the spare disk drive to the mirrorset.
SET MIRR1 REMOVE=DISK30000