Cisco UCS C22 User Manual

C-3
Cisco UCS C22 Server Installation and Service Guide
OL-26646-01
Appendix C RAID Controller Considerations
Mixing Drive Types in RAID Groups
Mixing Drive Types in RAID Groups
Following are the rules for mixing hard disk drive (HDD) and solid state drive (SSD) types in a RAID group
with the supported controllers.
SuperCap Power Modules (RAID Backup Units)
This server supports installation of one SuperCap power module (SCPM). The backup unit mounts to a
holder near the cooling fans (see
Figure 3-22). The SCPM is available only when using the optional LSI
MegaRAID-CV controller cards. 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 Replacing the SuperCap Power Module (RAID Backup Unit),
page 3-37.
Ta b l e C-2 Drive Type Mixing in RAID Groups
Mix of Drive Types 
in RAID Group Allowed?
SAS HDD + SATA HDD Yes
SAS SSD + SATA SSD Ye s
HDD + SSD No

Cisco UCS C22 Specifications

General

Brand	Cisco
Model	UCS C22
Category	Server
Language	English