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5–132 CLI Commands
Select PREFERRED_PATH=THIS_CONTROLLER to instruct “this controller” to
bring the unit online.
Select PREFERRED_PATH=OTHER_CONTROLLER to instruct the “other
controller” to bring the unit online.
See Chapter 2 for information regarding multiple bus failover.
ERROR_MODE=NORMAL
ERROR_MODE=FAILSAFE
Valid only on mirrorsets that have been enabled for DT_SUPPORT. Controls how the
mirroring software treats member failure.
Specify NORMAL and the mirroring software will fail any I/O—forcing the mirrorset
inoperative—when the normal/normalizing local membership falls to zero.
Specify FAILSAFE and the mirroring software will fail any I/O—forcing the
mirrorset inoperative—whenever either normal/normalizing remote membership or
normal/normalizing local membership falls to zero.
If FAILSAFE is specified, the DT_SUPPORT must be enabled on the mirrorset and
there must be at least one normal/normalizing local member and one normal/
normalizing remote member, otherwise an error is displayed.
READ_CACHE (Default)
NOREAD_CACHE
Sets the controller’s read-cache function.
Read caching improves performance in almost all situations. Therefore, it is
recommended to leave its default setting, READ_CACHE, enabled. However, under
certain conditions, such as when performing a backup, read-caching may not be
necessary since only a small amount of data is cached. In such instances, it may be
beneficial to disable read cache and remove the processing overhead associated with
caching.