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