Compaq HSZ80 manual 123, SET Nomultibusfailover Destroyunflushabledata

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