The Problem

Some storage technologies can not benefit from hardware RAID implementations as in their very design they expect just a bunch of disks (JBOD) an implement the redundancy on the application layer. One of this applications is Openstack Swift. The Problem is that some RAID devices do not support the JBOD mode. In this case you configure every disk as a standalone RAID0 with just one disk in it.

Create all Raid0 Drives

Some systems need to see all raw disks individually. To do this boot the node and enter the Megaraid CLI

-CfgEachDskRaid0 -aAll

will create virtual raid0 devices for each unconfigured device. If there already is a Raid config you don’t want to use anymore delete it first (the number after L is the number of the virtual disk:

-CfgLdDel L1 -a0

Documentation reference

• http://www.damtp.cam.ac.uk/internal/computing/docs/public/megacliraidlsi.html
• http://erikimh.com/megacli-cheatsheet/
• http://artipc10.vub.ac.be/wordpress/2011/09/12/megacli-useful-commands/
• https://twiki.cern.ch/twiki/bin/view/FIOgroup/DiskRefPerc

Using the BIOS command line

Use the commands like in the Linux CLI but omit the command itself.

MegaCli -EncInfo -aALL 

will be

-EncInfo -aALL

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