You might try
# dumpe2fs /dev/<your device> | grep superblock
Then from this output - if you can get any - use one of the backup
superblocks with
#e2fsck -b <number from above output> /dev/VolGroup00/<logical volume>
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Jason T. Slack-Moehrle
> Sent: 31 January 2012 02:38
> To: CentOS mailing list
> Subject: Re: One of my servers wont boot today
>
> > > > It says:
> > > >
> > > > /dev/VolGroup00/. The superblock could not be read or does not
> describe a correct ext2 filesystem. If the device is valid and it
> really contains an ext2 filesystem (and not swap or ufs or something
> else), then the superblock is corrupt, and you might try running e2fsck
> with an alternate superblock: e2fsck -b 8193 <device>
> > > >
> > > > So I tried e2fsck -b 8193 /dev/VolGroup00
> > > >
> > > > and it seems I get the same error coming up over and over
> > > >
> > > > I tried:
> > > >
> > > > fsck -y b=8193 /dev/VolGroup00 as well
> > > >
> > > > Any thoughts?
> > >
> > > You need to fsck each logical volume, not the whole volume group,
> e.g.
> > >
> > > e2fsck -b 8193 /dev/VolGroup00/LogVol01
> > sure, I thought of that too.
> >
> > under /dev/VolGroup00 is LogVol00, LogVol01, LogVol02.
> >
> > I do e2fsck -b 8193 /dev/VolGroup00/LogVol00 and I get the same super
> block error above.
> >
> > Same with LogVol01 and 02.
> Forgot:
>
> e2fsck: Bad magic number in super-block while trying to open LogVol00
>
> The superblock could not be read or does not describe a correct ext2
> filesystem. If the device is valid and it really contains an ext2
> filesystem (and not swap or ufs or something else), then the superblock
> is corrupt, and you might try running e2fsck with an alternate
> superblock:
> e2fsck -b 8193 <device>
>
>
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