HP Array Controller HSG V8.7 Software - Manual (Page 118)

3–40 HSG80 User’s Guide
RAIDset Switches
You can enable the following switches to control how a RAIDset
behaves to ensure data availability:
n Replacement policy
n Reconstruction policy
n Membership
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 equals or exceeds
the base member size (smallest disk drive at the time the RAIDset
was initialized). If more than one disk drive meets this criterion,
this switch selects 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.
Reconstruction Policy
Specify the speed with which the controller reconstructs the data from
the remaining operational disk drives and writes it to a replacement
disk drive:
n RECONSTRUCT=NORMAL (default) balances the overall
performance of the subsystem against the need for reconstructing
the replacement disk drive.
n RECONSTRUCT=FAST gives more resources to reconstructing
the replacement disk drive, which may reduce the subsystem’s
overall performance during the reconstruction task.