Backup Batteries - HP StorageWorks XP12000 - Disk Array Owner's Manual

Backup batteries

In each frame (DKC and DKU), internal nickel-metal-hydride batteries provide backup
power for the cache memory, shared memory, ACPs, CHIPs, and disk drives. If AC input
power is lost, the backup batteries enable the disk array to continue normal operations
for up to one minute. If power is not restored within one minute, the disk array executes
either the De-Stage or Backup battery operation mode.
1
If power is restored during the de-staging process, the disk array continues with
the data de-staging and power off processes.
2
If power is restored during the battery backup period, the disk array either
automatically restarts or must be restarted manually, depending on the setting of
the AUTO PS-ON ENABLE/DISABLE switch on the control panel.
HP representatives will help you determine the best battery mode for your configuration,
and will configure the selected mode during installation.
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Hardware