[CentOS] Fsck on mdraid array

Wed Jul 21 18:24:38 UTC 2010
Ross Walker <rswwalker at gmail.com>

On Jul 21, 2010, at 12:12 PM, Jussi Hirvi <listmember at greenspot.fi> wrote:

> Something seems to be wrong with my file systems, and I want to fsck 
> everything. But I cannot.
> The setup consists of 2 hds, carrying 3 raid1 (ext3) file systems (boot, 
> /, swap). OS is up-to-date CentOS 5.
> So I boot from CentOS 5.3 dvd in rescue mode, do not mount the file 
> systems, and try to run
>    fsck -y /dev/md0
>    fsck -y /dev/md1
>    fsck -y /dev/md2
> For each try I get an error message: "Superblock could not be found..." 
> "The device does not seem to contain a valid ext2 filesystem..."
> Well, of course not, the filesystem is ext3, not ext2.
> I also tried fsck.ext3, but the error messages stay the same.
> So, how could I fsck these arrays?

Are you using lvm on top of the mdraid?

If so you need to fsck the lvs not the mds.