HP Array Controller HSG V8.7 Software - Manual (Page 120)

3–42 HSG80 User’s Guide
Mirrorset Switches
You can enable the following switches to control how a mirrorset
behaves to ensure data availability:
n Replacement policy
n Copy speed
n Read source
Replacement Policy
Specify a replacement policy to determine how the controller replaces a
failed disk drive:
n POLICY=BEST_PERFORMANCE (default) puts the failed disk
drive in the failedset then tries to find a replacement (from the
spareset) that is on a different device port than the remaining
operational disk drives. If more than one disk drive meets this
criterion, this switch selects the drive that also provides the best fit.
n POLICY=BEST_FIT puts the failed disk drive in the failedset then
tries to find a replacement (from the spareset) that most closely
matches the size of the remaining, operational disk drives. If more
than one disk drive meets this criterion, this switch selects the one
that also provides the best performance.
n NOPOLICY puts the failed disk drive in the failedset and does not
replace it. The storageset operates with less than the nominal
number of members until you specify a replacement policy or
manually replace the failed disk drive.
Copy Speed
Specify a copy speed to determine the speed with which the controller
copies the data from an operational disk drive to a replacement disk
drive:
n COPY=NORMAL (default) balances the overall performance of
the subsystem against the need for reconstructing the replacement
disk drive.
n COPY=FAST allocates more resources to reconstructing the
replacement disk drive, which may reduce the subsystem’s overall
performance during the reconstruction task.