Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 309

5–123
Under some circumstances, the data in a failed controller's write-back cache may not
fail over to the operating controller's write-back cache. For example, cache data will
not failover if the operating controller has a failed cache battery because of the risk of
data loss if the power is interrupted.
Specify NODESTROY_UNFLUSHABLE_DATA to leave the unwritten data intact in
the failed controller's write-back cache. When the failed controller is replaced and
placed into service, the write-back cache data is flushed to the appropriate devices.
Specify DESTROY_UNFLUSHABLE_DATA to reconfigure the operational
controller before replacing the failed controller. The unwritten data of the failed
controller may reference devices not present in the new configuration. If you do not
destroy the old configuration data, it may conflict with the new configuration and
cause the subsystem to behave unpredictably.
CAUTION: Unflushed data cannot be recovered after it is destroyed.
Example
This example shows how to terminate failover mode between two controllers in a
dual-redundant configuration and destroy any cache data that remains in either
controller's cache:
SET NOMULTIBUS_FAILOVER DESTROY_UNFLUSHABLE_DATA
See also
SET FAILOVER
SET MULTIBUS_FAILOVER
SET NOFAILOVER
Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide