HP StorageWorks XP12000 HP StorageWorks XP12000 Disk Array owner's guide (AE00 - Page 30
Backup batteries
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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. 30 Hardware
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