[CentOS] RAID 5 on Install?

Gé Weijers ge at weijers.org
Thu Mar 11 01:00:19 UTC 2010

This can be done. You cannot boot from a software RAID5 device, however.

I'd do something like this:

on each drive, create a 'small' (256MB or so) primary partition 
(/dev/sda1, /dev/sdb1, and /dev/sdc1), and set the type to
"Software RAID".

Also create a second partition on each drive that takes up the rest of
the space, and also set it to "Software RAID".

Now create two RAID devices:

Combine /dev/sda1, /dev/sdb1 and /dev/sbc1 into a >>RAID1<< device, and 
format it as a ext3 partition mounted as /boot. (Grub can boot from a 
RAID1 device, but not from any other software RAID)

Combine /dev/sda2, /dev/sdb2, and /dev/sdc2 into a >>RAID5<< device, and 
set it up as an LVM PV.

Now create an LVM logical volume, and add your swap, root and any other 
file systems you want to it.

That should do it.


On Wed, 10 Mar 2010, Slack-Moehrle wrote:

> Hi All,
> I cannot seem to find a resource that will allow me to RAID5 3 x 1tb drives on system install. Can this be done?
> -jason
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

Gé Weijers <ge at weijers.org>

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