Mixing Drive Types In Raid Groups; Raid Backup Units - Cisco UCS C240 M4 Installation And Service Manual
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Appendix C
RAID Controller Considerations
Mixing Drive Types in RAID Groups
Table C-4
types in a RAID group. However, see the recommendations that follow for the best performance.
Table C-4
Mix of Drive Types
in RAID Group
SAS HDD + SATA HDD
SAS SSD + SATA SSD
HDD + SSD
Mixing Drive Types in RAID Groups
For the best performance, follow these guidelines:
•
•
•
RAID Backup Units
This server supports installation of one SuperCap power module (SCPM). The units mount to clips on
the removable air baffle (see
The SCPM provides approximately three years of backup for the disk write-back cache DRAM in the
case of a sudden power loss by offloading the cache to the NAND flash.
For SCPM replacement instructions, see
Battery), page
OL-32474-01
lists the technical capabilities for mixing hard disk drive (HDD) and solid state drive (SSD)
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.
Figure
3-35.
Allowed?
Yes
Yes
No
3-20).
Replacing the Supercap Power Module (RAID Backup
Cisco UCS C240 M4 Server Installation and Service Guide
Mixing Drive Types in RAID Groups
C-5
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