HP storageworks HSG80 Reference Manual page 148

CLI Command Descriptions
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.
REMOVE=disk-name
Instructs the controller to remove a member from an existing mirrorset. The disk
drive specified by disk-name is removed from the mirrorset specified by
mirrorset-name. The removed disk drive is added to the failedset.
NOTE: No other switches can be set when the REMOVE switch is specified.
For each reduced mirrorset, there must be at least one remaining normal member
after the reduction. A normal member is one whose contents are the same as the
other members.
Unlike the REDUCE command, the REMOVE switch does not change the
nominal number of members in the mirrorset. If the mirrorset has a replacement
policy and there are acceptable disk drives in the spareset, the controller adds disk
drives from the spareset to the mirrorset to make the actual number of members
equal to the nominal number of members.
NOTE: Normalizing members exist only when you first create a mirrorset or when you clear lost
data on a mirrored unit. The controller recognizes the member as normal, and all other original
mirrorset members as "normalizing." New data that is written to the mirrorset is written to all
members. The controller copies the normal member's existing data before the mirrorset was
created to the normalizing members. The controller recognizes the normalizing members as
normal when all the normalizing member's blocks are the same.
REPLACE=disk-name
2–132 HSG80 Array Controller V8.7 Command Line Interface Reference Guide