A P P E N D I X C Raid Controller Considerations - Cisco UCS C24 Installation And Service Manual

Appendix C RAID Controller Considerations
Table C-2
Table C-2 Cisco UCS C24 Large Form Factor RAID Options
Controller Style
LSI MegaRAID SAS
PCIe
9220-8i
LSI MegaRAID SAS
PCIe
9240-8i
LSI MegaRAID SAS
PCIe
9265CV-8i
Mixing Drive Types in RAID Groups
Table C-3
in a RAID group. However, see the best practices recommendations that follow for the best performance.
Table C-3
Mix of Drive Types
in RAID Group
SAS HDD + SATA HDD
SAS SSD + SATA SSD
HDD + SSD
Best Practices For Mixing Drive Types in RAID Groups
For the best performance, follow these guidelines:
•
•
•
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
OL-26647-01
lists the RAID options for the large form factor (LFF) version of the server.
SuperCap
Maximum Power
Drives Module
12 internal No
12 internal No
12 internal SCPM
lists the technical capabilities for mixing hard disk drive (HDD) and solid state drive (SSD) types
Drive Type Mixing in RAID Groups
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.
3-41.
RAID Levels
Supported
0, 1, 10
0, 1, 5, 10, 50
0, 1, 5, 6, 10, 50, 60
Allowed?
Yes
Yes
No
Figure C-2).
Replacing a SuperCap Power Module (RAID Backup Unit),
Cisco UCS C24 Server Installation and Service Guide
Mixing Drive Types in RAID Groups
Required Cables
(Each PID is a cable-pair kit.)
12 drives: 2 mini-SAS
UCSC-CABLE-A11
12 drives: 2 mini-SAS
UCSC-CABLE-A11
12 drives: 2 mini-SAS
UCSC-CABLE-A11
C-3