HP Array Controller HSG V8.7 Software - Manual (Page 288)

B–16 HSG80 User’s Guide
Specify COPY=NORMAL when operations performed by the
controller should take priority over the copy operation. If you specify
COPY=NORMAL, creating the mirrored data has a minimal impact on
performance.
POLICY=BEST_FIT
POLICY=BEST_PERFORMANCE (Default)
NOPOLICY
Sets the selection criteria the controller uses to choose a replacement
disk from the spareset when a mirrorset member fails.
Specify POLICY=BEST_FIT to choose a replacement disk drive from
the spareset that equals or exceeds the base member size (smallest disk
drive at the time the mirrorset was initialized). If there is more than one
disk drive in the spareset that meets the criteria, the controller selects a
disk drive with the best performance.
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 a disk drive that
equals or exceeds the base member size.
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 (see “SET
mirrorset-name,” page B–121).
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.