Supercap Power Modules (Raid Backup Units); Raid Controller Cabling; Cable Routing - Cisco UCS C24 Installation And Service Manual

Appendix C RAID Controller Considerations

SuperCap Power Modules (RAID Backup Units)

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
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.
For SCPM replacement instructions, see
page

RAID Controller Cabling

This section includes the following topics:
•
•

Cable Routing

The RAID controller connectors in this server are shown in
recommended cable routing path from the SAS expander to the possible controller locations.
Figure C-1
1
2
1 Drive backplane
2 SAS expander connectors
OL-26647-01
3-34.
Cable Routing, page C-3
Cisco UCS C24 Server RAID Cabling, page C-4
RAID Controller Cable Routing
Port 1
Port 0
Figure C-1).
Replacing a SuperCap Power Module (RAID Backup Unit),
SYS FAN1
CPU 1
SYS FAN2
SYS FAN3
CPU 2
SYS FAN4
3
3 SCPM mounting cage
4 PCIe risers for RAID controller cards
Cisco UCS C24 Server Installation and Service Guide
SuperCap Power Modules (RAID Backup Units)
Figure C-1. The red line indicates the
PCIe riser 1
4
PCIe riser 2
PSU 1 (bottom)
PSU 2 (top)
5 6
C-3