Replacing The Nvram Backup Battery Pack; Checking Battery Pack Status - Hitachi NAS Platform 4000 Series Hardware Reference Manual

Figure 31 Fan assembly - models 4060, 4080, and 4100
4. Put the new fan assembly into place.
5. Gently press the fan assembly back into the chassis. The fan electrical connector will
be aligned automatically when the fan is fully inserted into the chassis.
6. Secure the fan assembly in position by tightening the thumbscrews (turning them
clockwise).
7. Replace the front bezel.

Replacing the NVRAM backup battery pack

To replace the NVRAM backup battery pack in a server, you remove the old battery and
install the new replacement. Perform the battery pack replacement as quickly as
possible, and only when the new pack is present.
The replacement NVRAM backup battery pack comes pre-assembled. Do not remove the
batteries from the case.
Note: If possible, shut down the server before replacing the battery backup
pack. Shutting down the server or migrating all of the EVSs to the other node
is not required. However, during the replacement procedure, there will be a
period of time when the NVRAM contents are not backed up by the battery
pack. If a power failure occurs during this period, the NVRAM contents may
be lost.

Checking battery pack status

The battery pack status LED indicates the status of the server's NVRAM battery pack.
Hitachi NAS Platform and Hitachi Unified Storage Series 4000 Hardware Reference
Chapter 5: Replacing server components
Replacing the NVRAM backup battery pack
67