Compaq HSZ80 manual

5–97

The following tasks are performed when the NOMIRRORED_CACHE switch is specified: Both controllers must be operational before this command is accepted.

■Data in write-back cache is flushed when cache is configured in non-mirrored mode.

■Enables mirrored write-back cache on both controllers.

■If an invalid cache configuration exists within the cache modules, an error is generated.

Issue this switch through only one controller. The controller must contain a valid cache configuration before specifying this switch. See Chapter 2 for rules regarding valid cache configurations. The controllers automatically restart when this switch is specified.

NOTE: All unwritten write-cached data is automatically flushed from cache before restart when the MIRRORED_CACHE switch is specified. Depending on the amount of data to be flushed, this command may take several minutes to complete before the controller is restarted.

The NOMIRRORED_CACHE switch disables mirror mode. Data in write-back cache is flushed when this switch is entered from mirrored mode. This switch disables mirrored write-back cache on both controllers. Therefore, this switch is only to be issued through one controller. The controller must contain a valid cache configuration before this switch is assigned. Unlike going from nonmirrored mode to mirrored mode, going from mirrored mode to nonmirrored mode is permitted with a failed cache module. The controller automatically restarts when this switch is specified.

Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide