Digital Equipment HSZ40, Справочное руководство

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2–68 SET NOFAILOVER (SET NOMULTIBUS_FAILOVER)
SET NOFAILOVER (SET NOMULTIBUS_FAILOVER)
Takes T
HIS
_
CONTROLLER
and O
THER
_
CONTROLLER
(if reachable) out of dual-redundant
(failover) mode. Immediately after entering this command, you should remove one
controller from the shelf because the sharing of devices is not supported by nonredundant
controllers.
The controller on which you enter the command changes to nonfailover mode, even if the
other controller is not reachable. All units that were accessed through O
THER
_
CONTROLLER
failover to T
HIS
_
CONTROLLER
. No configuration information is lost when changing modes.
Format
SET NOFAILOVER
Switches
NODESTROY_UNFLUSHABLE_DATA (Default)
DESTROY_UNFLUSHABLE_DATA
___________________________ Note ____________________________
This switch has no effect if both controllers are operational.
____________________________________________________________
If one of your dual-redundant controllers fails before you can properly shut it down with
the
SET NOFAILOVER
or
SHUTDOWN
commands, you will have to use this switch.
Under some circumstances, the data in a failed controller’s write-back cache may not
failover to the operational controller’s write-back cache. For example, if the cache battery
has failed on the operational controller, failover will not jeopardize the write-cache data of
the failed controller by trying to move it to the write-back cache associated with the
operational controller. This makes the write-cache data associated with the failed
controller unflushable.
The
SET NOFAILOVER NODESTROY
_
UNFLUSHABLE
_
DATA
leaves the unwritten data intact in
the failed controller’s write-back cache. When you replace the failed controller, it will
flush the write-cache data to the appropriate devices when the controller comes online.
_________________________ Caution ___________________________
You will not be able to recover or obtain unwritten data once it has been
destroyed.
____________________________________________________________