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Subsystem cache battery
The battery unit in each controller provides backup power to maintain any cached
data not written to disks in the event of a power loss. The battery units can provide
power to the data caches in the RAID controllers for up to three days.
Statement 2:
CAUTION:
When replacing the lithium battery, use only an equivalent type battery
recommended by the manufacturer. If your system has a module containing a
lithium battery, replace it only with the same module type made by the same
manufacturer. The battery contains lithium and can explode if not properly
used, handled, or disposed of.
Do not:
v Throw or immerse into water
v Heat to more than 100° C (212° F)
v Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
Replace the battery units in the DS4700 Express when they are identified as failing
by the DS4000 Storage Manager Subsystem Management window, or when the
Battery LEDs or Battery Needs Attention LEDs light. These LEDs are located on the
power supply and fan units and on the battery unit respectively, as shown in
Figure 104 on page 143.
Replace only the battery unit that is indicated as failed by the LEDs or in the
DS4000 Storage Manager Subsystem Management window. You do not need to
replace both battery units when the Battery LEDs indicate that only one battery unit
has failed.
If the battery age expires, do not call IBM technical support to replace the battery.
Instead, reset the battery age using the procedure described in the Storage
Manager online help. You should only replace the battery when it is in a failed state,
as indicated by the Storage Manager Recovery Guru.
Each power supply and fan unit has green Battery LEDs on the back that indicates
the battery status of each battery unit, as follows:
v The LED is on and remains steady when the battery is fully charged.
v The LED flashes when the battery is charging or performing a self-test.
v The LED is off if the battery or the battery charger has failed.
The battery unit also has a battery failure indicator LED that is located on the
battery unit. This LED will light if the battery fails to hold a charge.
The battery performs a self-test at startup and every 25 hours thereafter (during
which time the Battery LED flashes). If necessary, the battery begins recharging at
that time. If the battery fails the self-test, the Battery LED turns off, indicating a
battery fault.
142 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide