Backup Batteries - HP StorageWorks XP12000 Owner's Manual

Backup batteries

XP12000 Hardware
In each frame (DKC and DKU), internal nickel-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.
Figure 3. Battery operation modes
If power is restored during the de-staging process, the disk array
1
continues with the data de-staging and power-off processes.
If power is restored during the battery backup period, the disk array
2
either automatically restarts or must be restarted manually,
depending on the setting of the AUTO PS-ON ENABLE/DISABLE
switch (page 29)
"Recovering from an unplanned power outage"
on the control panel. For more information, see
(page 49).
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