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Cisco UCS C22 Server Installation and Service Guide
OL-26646-01
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
Table C-3 lists the technical capabilities for mixing hard disk drive (HDD) and solid state drive (SSD) types
in a RAID group. However, see the best practices recommendations that follow for the best performance.
Best Practices For Mixing Drive Types in RAID Groups
For the best performance, follow these guidelines:
• Use either all SAS or all SATA drives in a RAID group.
• Use the same capacity for each drive in the RAID group.
• Never mix HDDs and SSDs in the same RAID group.
Table C-2 Cisco UCS C22 Large Form Factor RAID Options
Controller Style
Maximum
Drives SCPM
1
1. SCPM = SuperCap power module (the RAID backup unit).
RAID Levels
Supported Required Cables
Embedded
MegaRAID
2
2. The embedded RAID controller must be enabled in the BIOS.
Onboard 4 SATA
(default) or
4 SAS
3
internal
3. Support for four SAS drives requires an optional SCU upgrade ROM module on the motherboard.
No 0, 1, 5
4
, 10
4. Embedded RAID 5 support requires an optional software key module.
4 drives: 1 mini-SAS
UCSC-CABLE-A9
LSI MegaRAID
9220-4i
PCIe 4 internal No 0, 1, 10 4 drives: 1 mini-SAS
UCSC-CABLE-A10
LSI MegaRAID SAS
9240-8i
PCIe 4 internal No 0, 1, 5, 10, 50 4 drives: 1 mini-SAS
UCSC-CABLE-A10
LSI MegaRAID SAS
9265CV-8i
PCIe 4 internal SCPM 0, 1, 5, 6, 10, 50, 60 4 drives: 1 mini-SAS
UCSC-CABLE-A10
Table 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