HP StorageWorks XP10000 Owner's Guide

34 HP StorageWorks XP10000 Disk Array Owner’s Guide
Backup batteries
Internal batteries provide backup power for the cache memory, shared
memory, MIXs, CHIPs, and disk drives. The backup batteries enable the
disk array to continue normal operations for up to 20 milliseconds after the
loss of AC power.
When AC power is off longer than 20 milliseconds, the disk array executes
its backup process. This process copies the contents of cache and shared
memory to disk and then supports cache and shared memory for up to 36
hours. When AC power is restored after battery backup is exhausted, time
is required for staging data from disk back to shared and cache memory.
Figure 5. Battery operation modes
When power is restored, if the Auto-Power-On jumper is in the ENABLE
position, the disk array powers on automatically. If the jumper is in the
DISABLE position, you must turn the power switch on to power up the
disk array. HP representatives will assist you in determining which
Auto-Power-On mode is best for your disk array configuration and will
configure the selected mode during disk array installation.
Power Failure Occurs
20
milliseconds
Disk Array
Operating
36 hours
CM and SM is backed up by battery
Ç*1
Back-up Mode
*1: When power is restored after a failure while backup power is supplied by the battery, the disk array
power-on process depends on the status of the Auto-Power-On jumper position.
ENABLE position: The disk array powers on automatically.
DISABLE position: The disk array powers on when you switch the PS ON/OFF (power) switch to ON.
Power Failure

HP StorageWorks XP10000 Specifications

General

Brand	HP
Model	StorageWorks XP10000
Category	Disk array system
Language	English