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Cisco UCS C240 M4 Server Installation and Service Guide
OL-32474-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing the Supercap Power Module (RAID Backup Battery)
This server supports installation of one supercap power module (SCPM). The unit mounts to a clip on
the removable air baffle (see Figure 3-21). The SCPM requires that you have a transportable memory
module (TMM) attached to your RAID controller card because the connector for the SCPM cable is on
the TMM.
See also:
• Replacing a Cisco Modular RAID Controller Card, page 3-36
• Replacing a Modular RAID Controller Transportable Memory Module (TMM), page 3-38
The SCPM 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.
Warning
There is danger of explosion if the battery is replaced incorrectly. Replace the battery only with the
same or equivalent type recommended by the manufacturer. Dispose of used batteries according to
the manufacturer’s instructions.
Statement 1015
Step 1 Power off the server as described in Shutting Down and Powering Off the Server, page 3-9.
Step 2 Slide the server out the front of the rack far enough so that you can remove the top cover. You might have
to detach cables from the rear panel to provide clearance.
Caution If you cannot safely view and access the component, remove the server from the rack.
Step 3 Remove the top cover as described in Removing and Replacing the Server Top Cover, page 3-10.
Step 4 Remove an existing SCPM:
a. Disconnect the existing SCPM cable from the transportable memory module (TMM) that is attached
to the modular RAID controller card.
b. Pull back the plastic clip that closes over the SCPM slightly, and then slide the SCPM free of the
clips on the air baffle mounting point (see Figure 3-21).
Step 5 Install a new SCPM:
a. Slide the new backup unit into the holder on the air baffle mounting point until the clip clicks over
the top edge of the SCPM.
b. Connect the cable from the SCPM to the TMM that is attached to the modular RAID controller card.
Note Put the cable through the opening on the rear of the air baffle (rather than over the air baffle) to
keep the cable from interfering with the top cover of the server.
Step 6 Replace the top cover.
Step 7 Replace the server in the rack, replace cables, and then power on the server by pressing the Power button.
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