Battery; Servicing Notes; Indicator Lights On The Ds4400 Storage Server Bezel - IBM TotalStorage DS4400 User Manual

Figure 35. Indicator lights on the DS4400 Storage Server bezel
6. Use the storage-management software to check the status of both controllers. If
7. Reinsert the controller CRU. Then, if there are no error messages or controller
8. Replace the DS4400 Storage Server bezel, as shown in Figure 22 on page 23.

Battery

The battery CRU contains rechargeable batteries and a battery-charger board. The
battery CRU plugs into the front of the DS4400 Storage Server (see Figure 36 on
page 47) where it provides backup power to the cache memory in both controllers.
During a power outage, a properly charged battery CRU maintains electrical current
to the controllers for up to five days with 1 Gb cache memory installed. All data
stored in memory is preserved as long as the batteries can sustain power to the
cache memory. However, the battery does not provide power to the rest of the
system during a power outage. Therefore, the system is not able to write data to
hard disk drives without a backup power source.

Servicing notes

Consider the following when servicing the battery in the DS4400 Storage Server:
v The battery has a three-year life expectancy. Replace the battery every three
v The service label on the battery provides a blank line for recording the date on
v When a battery fails, the fault light on the battery is lit. For more information
v If you replace the battery and still experience battery problems (for example, loss
44
IBM TotalStorage DS4400 Fibre Channel Storage Server: User's Guide
Power
Power supply
Controller fan
Controller
Fast write cache
v If the green power indicator is on and the amber fault indicator is off, go to
Step 8.
v If the green power indicator remains off or the fault indicator is on after a few
seconds, make sure that the controller CRU is locked into place. If the fault
indicator remains on, go to Step 6.
applicable, perform the recovery procedures required by the software. If this
corrects the fault and the DS4400 Storage Server is operating without error, go
to Step 8. If not, go to Step 7.
faults, go to Step 8 If there is still a problem, call for service.
years or whenever it fails to hold a charge. Operating the DS4400 Storage
Server in an unsupported environment (above 35° C or 95° F) lowers the life
expectancy of the battery.
which the battery was last serviced (see Figure 37 on page 48). 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
documentation and online help.
about indicator lights, see "Battery indicator lights" on page 31.
of battery power to the controllers or batteries not charging properly), the DS4400
DS4400