Figure 32: Rear Drive Module Air Diffuser
Rear RAID supercap unit location on the inside
surface of the diffuser
3
Air diffuser top view
This diffuser is required when SAS/SATA
drivs are installed in the rear drive module.
1
Alignment flange on chassis floor
4
Diffuser alignment points against the chassis
mid-brace
2
Replacing the Rear RAID Supercap Unit
This server supports installation of up to two supercap units, one for a front RAID controller and one for a
rear RAID controller. The rear supercap unit mounts to a clip on the air diffuser that wraps around the internal
drive module.
The supercap provides approximately three years of backup for the disk write-back cache DRAM in the case
of a sudden power loss by offloading the cache to the NAND flash.
Cisco UCS C480 M5 Server Installation and Service Guide
75
Maintaining the Server
Replacing the Rear RAID Supercap Unit
