Mixing Drive Types In Raid Groups; Raid Backup Units - Cisco UCS C220 Installation And Service Manual
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Mixing Drive Types in RAID Groups
Mixing Drive Types in RAID Groups
Table C-3
types 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:
•
•
•
RAID Backup Units
This server supports installation of one SuperCap Power Module (SCPM). The unit mounts to a holder
on the left-side air baffle (see
The iBBU09 battery backup unit (BBU) has been phased out by Cisco and replaced with the SuperCap
Note
power module (SCPM). If you are replacing a BBU, order the SCPM for the replacement
(UCS-RAID-CV-SC=). Cards that used the BBU are compatible with the SCPM.
•
Cisco UCS C220 Server Installation and Service Guide
C-4
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
The optional SCPM 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.
Allowed?
Yes
Yes
No
3-24).
Appendix C
RAID Controller Considerations
OL-25760-01
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