Re: e2fsck: Bad magic number in super-block

["M. Lewis" <cajun cajuninc com>]

Matija Nalis wrote:
> On Tue, Oct 31, 2006 at 08:15:30PM -0500, M. Lewis wrote:
> > I posted this to the Fedora-list, but thought I might get some 
> > additional information here as well.
> >
> > I have a HD that refuses to mount with a 'bad magic number in 
> > super-block'. I'm running FedoraCore 6 x86_64.
> >
> > [root moe ~]# fdisk -l /dev/hdc
> >
> > Disk /dev/hdc: 250.0 GB, 250059350016 bytes
> > 255 heads, 63 sectors/track, 30401 cylinders
> > Units = cylinders of 16065 * 512 = 8225280 bytes
> >
> >    Device Boot      Start         End      Blocks   Id  System
> > /dev/hdc1   *           1          13      104391   83  Linux
> > /dev/hdc2              14        9729    78043770   8e  Linux LVM
>
> are you ABSOLUTELY SURE that /dev/hdc2 really containt DIRECTLY the ext3
> filesystem ?
>
> By FDISK output, it looks like it is not ext3 partition, but a physical
> volume controlled by LVM, so you should use LVM tools to find real data
> (vgscan, vgdisplay, pvscan, lvscan, ...)
>
> the ext3 partition you are looking for is probably on logical volume on that
> LVM...

Thanks Matija. No, at this point the only thing I am sure of is I can't 
mount the drive with my data.

I'm not familiar with any of the LVM tools. Here's the output of the 
tools you suggested:

[root moe ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "VolGroup00" using metadata type lvm2

[root moe ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               74.41 GB
  PE Size               32.00 MB
  Total PE              2381
  Alloc PE / Size       2380 / 74.38 GB
  Free  PE / Size       1 / 32.00 MB
  VG UUID               vXWCaM-XkRG-l28x-tyH1-Rrf4-KjXF-AfASLY

[root moe ~]# pvscan
  PV /dev/hda2   VG VolGroup00   lvm2 [74.41 GB / 32.00 MB free]
  Total: 1 [74.41 GB] / in use: 1 [74.41 GB] / in no VG: 0 [0   ]

[root moe ~]# lvscan
  ACTIVE            '/dev/VolGroup00/LogVol00' [72.44 GB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GB] inherit

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