Compaq HSG80 - StorageWorks RAID Array Controller Spécifications télécharger pdf (Page 292)

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CLI Commands

MIRRORED_CACHE

NOMIRRORED_CACHE (Default)

Enables the mirrored-write-back-data cache feature on dual-redundant controllers.

When changed, both controllers restart for the new switch setting to take effect.

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.

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Compaq HSG80 - StorageWorks RAID Array Controller Spécifications Page 292