HP StorageWorks XP12000 Disk Array owner's guide (AE002-96029, October 2006)

Backup batteries

In each frame (DKC and DKU), internal nickel-metal-hydride batteries provide backup

powerforthecachememory,sharedmemory,ACPs,CHIPs,anddiskdrives.IfACinput

power is lost

, the backup batteries enable the disk array to continue normal op erations

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.

If power is restored during the de-staging process, the disk array continues with

the da

ta de-staging an d power off processes.

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 f or your conﬁguration,

and will conﬁgure the selected mode during installation.

Hardware