C-3
Cisco UCS C24 Server Installation and Service Guide
OL-26647-01
Appendix C RAID Controller Considerations
Mixing Drive Types in RAID Groups
Table C-2 lists the RAID options for the large form factor (LFF) version of the server.
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.
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 Figure C-2).
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 Replacing a SuperCap Power Module (RAID Backup Unit),
page 3-39.
7. The 9240-8i controller can create a RAID array with maximum 16 drives, even if it detects more than 16 drives.
Tab l e C-2 Cisco UCS C24 Large Form Factor RAID Options
Controller Style
Maximum
Drives
SuperCap
Power
Module
RAID Levels
Supported
Required Cables
(Each PID is a cable-pair kit.)
LSI MegaRAID SAS
9220-8i PCIe 12 internal No 0, 1, 10 12 drives: 2 mini-SAS
UCSC-CABLE-A11
LSI MegaRAID SAS
9240-8i PCIe 12 internal No 0, 1, 5, 10, 50 12 drives: 2 mini-SAS
UCSC-CABLE-A11
LSI MegaRAID SAS
9265CV-8i PCIe 12 internal SCPM 0, 1, 5, 6, 10, 50, 60 12 drives: 2 mini-SAS
UCSC-CABLE-A11
Tab l e C-3 Drive Type Mixing in RAID Groups
Mix of Drive Types
in RAID Group Allowed?
SAS HDD + SATA HDD Yes
SAS SSD + SATA SSD Yes
HDD + SSD No