Compaq HSZ80 manual Allocationclass, CACHEFLUSHTIMER=n CACHEFLUSHTIMER=10 Default, Cacheups

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ALLOCATION_CLASS

Allocation class is a unique identification number assigned to the controller pair under certain operating systems. The value for an allocation class is 1–4294967295. In DIGITAL Open VMS, this is a 2-byte number (do not specify a number over 65535); for DIGITAL UNIX, it is a 4-byte number. It is reported in response to the SCSI inquiry command and is the same for all units connected to one or both controllers. It allows the user to place a unique number in the allocation class value

(n). The allocation class value allows the host to identify the controllers that are a matched dual-redundant pair. This number should be unique for every pair of dual- redundant controllers in the cluster.

NOTE: This value must not be zero (default) in dual-redundant configurations in host systems that implement allocation class. A zero value in this configuration causes the operating system to disable failover between the controller pair. Some operating systems do not implement allocation class, in which case the default of zero has no meaning.

CACHE_FLUSH_TIMER=n

CACHE_FLUSH_TIMER=10 (Default)

Specifies how many seconds (1–65535) of idle time on a unit may elapse before the write-back cache flushes data for that unit. The default setting is 10 seconds. When changed, the new value entered for this switch takes effect immediately.

CACHE_UPS

NOCACHE_UPS (Default)

Specifies whether the controller should perform regular battery condition checks. When changed, you must restart both controllers in order for the new setting to take effect.

Specify CACHE_UPS if your storage subsystem power is supported by an uninterruptable power supply (UPS). This causes RAIDsets and mirrorsets to always be available, regardless of the condition of the cache batteries.

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