HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

CLI Command Descriptions
189HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
MIRRORED_CACHE
NOMIRRORED_CACHE
Caution: Before invoking the MIRRORED_CACHE or
NONMIRRORED_CACHE command, carefully read the following
information to avoid damaging data or the subsystem.
Enables the mirrored writeback data cache feature on dual-redundant
controllers. If changed, both controllers restart for the new switch setting to
take effect.
The following tasks are performed if the NOMIRRORED_CACHE switch is
specified:
■ Data in writeback cache is flushed if cache is configured in Nonmirrored
mode.
■ Mirrored writeback cache on both controllers is enabled.
■ If an invalid cache configuration exists within the cache modules, an error
is generated.
■ Persistent reservations for all units are lost after you change the mirrored
cache setting.
Note: Both controllers must be operational before this command is accepted.
Issue this switch through only one controller. The controllers must have a
valid cache configuration before specifying this switch. The controllers
automatically restart if this switch is specified.
Note: All unwritten write-cached data is automatically flushed from the cache before
restart if the MIRRORED_CACHE switch is specified. Depending on the amount of data
to be flushed, this command can take several minutes to complete before the controller
is restarted.
The NOMIRRORED_CACHE switch disables Mirror mode. Data in writeback
cache is flushed if this switch is entered from Mirrored mode. This switch
disables mirrored writeback cache on both controllers. Therefore, this switch