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6. Use the storage-management software to check the status of both controllers. If
applicable, perform the recovery procedures required by the software. If this
corrects the fault and the DS4500 Storage Subsystem is operating without error,
go to Step 8. If not, go to Step 7.
7. Reinsert the controller CRU. Then, if there are no error messages or controller
faults, go to Step 8. If there is still a problem, call for service.
8. Replace the DS4500 Storage Subsystem bezel (see “Replacing the front bezel”
on page 44).
Replacing a battery unit
Attention: Before you replace a battery unit, consider the following factors:
v The battery has a three-year life expectancy. Replace the battery when the
DS4000 Storage Manager displays the battery age exceeded event message or
whenever it fails to hold a charge. Operating the DS4500 Storage Subsystem in
an unsupported environment (above 35° C or 95° F) lowers the life expectancy of
the battery.
v The service label on the battery provides a blank line for recording the date on
which the battery was last serviced (see Figure 101 on page 150). Check this
label to determine when to replace the battery. For information about using the
software to track battery age, refer to the IBM DS4000 Storage Manager online
help.
v When a battery fails, the fault LED on the battery is lit (see “Battery unit LEDs”
on page 131).
v If you replace the battery and still experience battery problems (for example, loss
of battery power to the controllers or batteries not charging properly), the DS4500
Storage Subsystem might have defective components or connections. Check the
storage-management software for indications of other component failures.
When
instructed by the storage-management software, replace the battery unit by
using the following procedure:
Attention: Because the battery is a sealed unit, you must replace the entire CRU
(not just the batteries) to keep the battery backup system in working order. Opening
the battery CRU voids your warranty.
1. Use the storage-management software to disable caching. Caching is disabled
when the Cache active (Fast write cache) LED is off. Data in cache is
unprotected if a power outage occurs while the battery unit is out of operation.
Statement 8:
Chapter 5. Replacing components 147