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Cisco UCS C24 Server Installation and Service Guide
OL-26647-01z
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing a SuperCap Power Module (RAID Backup Unit)This server supports installation of up to two SuperCap power modules (SCPMs). The SCPMs mount
inside a cage that is next to the cooling fans (see Figure 3-22).
The SCPM is supported only when using the LSI MegaRAID-CV controller card. This supercap module
provides approximately 3 years of backup for the disk write-back cache DRAM in the case of sudden
power loss by offloading the cache to the NAND flash.
To replace the RAID backup unit, follow these steps:
Step 1 Remove an SCPM (see Figure 3-22).
a. Power off the server as described in the “Shutting Down and Powering Off the Server” section on
page 3-6.
b. Slide the server out the front of the rack far enough so that you can remove the top cover. Y ou 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.
c. Remove the top cover as described in the “Removing and Replacing the Server Top Cover” section
on page 3-7.
d. Disconnect the RAID controller cable that is attached to the existing SCPM.
e. Remove the cage that holds the SCPMs (see Figure 3-22).
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Use a screwdriver to loosen the captive thumbscrew that secures the cage to the chassis floor.
Note If you cannot access the thumbscrew, you can remove the front chassis panel to provide
clearance. See Removing and Replacing the Front Chassis Panel, page 3-8.
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Push the cage toward the server front about 1/4 inch to free the pegs on the sides of the cage
from the keyed slots on the chassis bracket.
f. Remove the SCPM holder, with backup unit, from the cage (see Figure 3-22).
g. Remove the SCPM from the holder.
Step 2 Install a new SCPM:
a. Insert the new SCPM into the empty holder that you removed in the previous step (see Figure 3-22).
b. Insert the holder, with new SCPM, into the cage.
c. Replace the cage to the chassis.
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Set the cage in place in the chassis bracket, aligning the pegs on the sides of the cage with the
keyed slots in the chassis bracket.
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Push the cage toward the server rear about 1/4 inch to lock it into the keyed slots on the chassis
bracket.
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Use a screwdriver to tighten the captive thumbscrew that secures the cage to the chassis floor.
d. Reconnect the cable from the RAID controller to the new SCPM.
e. Replace the top cover.
f. Replace the server in the rack, replace cables, and then power on the server by pressing the Power
button.