Notes On Supported Embedded Megaraid Levels - Cisco UCS C240 Installation And Service Manual

Appendix C RAID Controller Considerations
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Notes on Supported Embedded MegaRAID Levels

The following RAID levels are supported by the embedded MegaRAID controller.
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None of these RAID levels require drives of the same size. The smallest drive in the array determines
Note
the size of the VD.
Note An array can be divided into multiple VDs of the same RAID level, except when using RAID 10. Mixed
arrays are not permitted. For example, you cannot configure a three-drive array into RAID 0 and RAID 5
VDs. Unlike RAID 0, 1, and 5, you cannot create multiple RAID 10 VDs from the same array. A single
RAID 10 VD uses up the entire array.
OL-25761-01
Enabling the Embedded RAID Controller in the BIOS, page C-11
Disabling the Embedded RAID Controller in the BIOS, page C-12
Launching the LSI Embedded RAID Configuration Utility, page C-12
Installing LSI MegaSR Drivers For Windows and Linux, page C-12
RAID 0—You can configure a RAID 0 virtual drive (VD) using one or more physical drives (PDs).
This level supports up to eight VDs and PDs.
RAID 1—A RAID 1 VD is configured from only two PDs. This level supports up to eight PDs (four
RAID arrays) and eight VDs.
RAID 5—You can configure a RAID 5 VD using three or more PDs. This level supports up to eight
PDs and eight VDs.
RAID 10—This is a spanned VD; that is, RAID 0 is implemented on two or more RAID 1 VDs. This
level supports up to eight PDs (two to four RAID 1 volumes spanned) and one VD.
Cisco UCS C240 Server Installation and Service Guide
Embedded MegaRAID Controller
C-9