[linux-lvm] can't mount vfat fs on lvm created by winxp guest on xen

[Yann Boutin]

On 15:05 Sat 28 Apr     , Bryn M. Reeves wrote:
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> Yann Boutin wrote:
> > Greetings, 
> > I've had no success with mounting a vfat file system created by a 
> > Windows XP guest on a lvm volume. Windows XP guest is running under xen 3.0.5 rc3.
> > 
> > # mount -t vfat /dev/vg1/win1 /mnt/
> > mount: wrong fs type, bad option, bad superblock on /dev/vg1/win1,
> >        missing codepage or other error
> >        In some cases useful info is found in syslog - try
> >        dmesg | tail  or so
> > 
> 
> Presumably, the windows install partitioned the raw storage?
> 
> Try running "file -s /dev/vg1/win1". If it says something like this:
> 
> /dev/sda: x86 boot sector; partition 1: ID=0x83, active, starthead 1,
> startsector 63, 208782 sectors; partition 2: ID=0x8e, starthead 0,
> startsector 208845, 195157620 sectors, code offset 0x48
> 
> Then there's a partition table on the device and the VFAT file system is
> in a partition on it.
> 
> You can map those partitions using kpartx. Run:
> 
> kpartx -a /dev/vg1/win1
> 
> And you should see some new entries in /dev/mapper like win1p1 win1p2
> etc. You can remove them with:
> 
> kpartx -d /dev/vg1/win1

Actually I solved my problem the same way but by hand. I map the first inner partition with dmsetup with adding an offset of 63 blocks. But really thanks for your answer and Kpartx is much simplier.

I've started a similar thread here too :
http://lists.xensource.com/archives/html/xen-users/2007-04/msg00846.html

Best regards

   Yann.