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Purpose of This Document

This document gives an overview of RAID technology and describes the various RAID levels, as well as the RAID

levels supported on Cisco UCS

Integrated Management Controller (Cisco IMC), including creating RAID volumes and hot spares and replacing a

drive. In addition, it discusses how to migrate the existing RAID level using the WebBIOS utility and how to use the

LSI MegaCLI utility.

A redundant array of independent disks (RAID) is a group, or array, of independent physical drives that provides

high performance and fault tolerance. The RAID drive group appears to the host computer as either a single unit or

multiple virtual units. I/O is expedited because several drives can be accessed simultaneously.

RAID drive groups provide greater data storage reliability and fault tolerance than single-drive storage systems.

Data loss resulting from a drive failure can be prevented by using the remaining drives to reconstruct missing data.

RAID has become popular because it improves I/O performance and increases storage subsystem reliability.

The RAID levels supported on any Cisco UCS C-Series server vary by RAID controller and can be verified in Cisco

IMC.

Example: RAID levels supported on two different controllers.

Server

C220/ C240 M3

●

Drives. The supported RAID levels can be seen in the drop-down menu next to "RAID Level" (Figure 1).

Figure 1.

C220 and C240 M3 Rack Servers. It also describes how to work with the Cisco

Controller

Cisco UCS RAID SAS 2008M-8i Mezzanine Card

LSI MegaRAID SAS 9271CV-8i

Verifying the Supported RAID Levels

Supported RAID Levels

0, 1, 1E, 5, 10, 50

0, 1, 5, 6, 10, 50, 60

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