C-2
Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Appendix C RAID Controller Considerations
Mixing Drive Types in RAID Groups
Mixing Drive Types in RAID Groups
Table C-2 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.
Battery Backup Unit
This server supports installation of one LSI RAID battery backup unit (BBU). The unit mounts to the
chassis wall (see
Replacing the SAS Riser Battery Backup Unit, page 3-18).
The optional LSI BBU is available only when using an LSI MegaRAID 9260-8i controller card. This
BBU provides approximately 72 hours of battery backup for the disk write-back cache DRAM in the
case of sudden power loss.
RAID Controller Cabling
This section includes the following topics:
• Cable Routing, page C-2
• Cisco UCS C460 Server Cabling, page C-4
Cable Routing
The red line in Figure C-1 shows the recommended cable routing path from the backplane to the SAS
riser connectors.
Ta b l e C-2 Drive Type Mixing in RAID Groups
Mix of Drive Types
in RAID Group Allowed?
SAS HDD + SATA HDD Ye s
SAS SSD + SATA SSD Yes
HDD + SSD No
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