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5–12 CLI Commands
Specify COPY=FAST to allow the creation of mirrored data to take precedence over
other controller operations. When you specify COPY=FAST, the controller uses more
resources to create the mirrored data, and copying takes less time. However, overall
controller performance is reduced.
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.
DT_SUPPORT
NODT_SUPPORT
Specifies if disaster tolerant functionality is enabled on this mirrorset. If some
members are or may be remote and disaster tolerant functionality is supported, set
DT_SUPPORT. If all members are—and intend to remain—local and disaster tolerant
functionality is not supported, set NODT_SUPPORT.
If DT_SUPPORT is enabled, the mirrorset has the following restrictions: NOPOLICY
is enforced and NOWRITEBACK_CACHE is enforced.
If NODT_SUPPORT is enabled and any of the members have REMOTE set, then the
command will fail with an error.
NOTE: This command will fail if you change the setting while the mirrorset is in use
by a higher level.
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. If DT_SUPPORT is enabled, no policy can
be selected.