HP StorageWorks 200 Storage Virtualization System owner's guide (AE071-96004, October 2006)

Backup batteries
Internal batteries provide backup power for the cache memory, shared memory, and the
CHIPs. The backup bat teries enable the system to continue normal operations for up to
20 milliseco
nds after the loss of AC power.
When AC power is off longer than 20 milliseconds, the system executes its backup
process. This process copies the contents of cache and shared memor y to storage and
then supports cache and shared memory for up to 36 hours. Anytime the length of a
power outage exceeds the 36–hour battery backup time, contact HP for assistance
with recovery.
When power is restored, if the Auto-Power-On jumper is in the E NABLE p osition, the
syste
m powers on automatically. If the jumper is in the DISABLE position, you must
turn the power switch on to power up the system. HP representatives will assist you in
determining which Auto-Power-On mode is best for your sy stem configuration and will
configure the selected mode during system installation.
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