[linux-lvm] Broken disk, any chances ?

[Jonathan E Brassow]

You could write a for loop and use dm to try mounting the disk.

i=0; while true; do
   i=$(($i + 1))
   size=$((<disk_size> - $i))
   echo "0 $size linear /dev/<disk> $i" | dmsetup create recover
   mount -t ext3 /dev/mapper/recover /mnt
   if [ $? -eq 0 ] ; then echo "FS found at offset $i"; break; fi
done

Remember to record the offset once found and start from there plus 1 
next time... hopefully finding the next FS on the disk.  I'm not sure 
if this setup would get confused by the multiple super blocks that ext 
writes out or not.  Couldn't hurt to try.

  brassow

On Aug 2, 2005, at 3:57 AM, Thomas Svedberg wrote:

> So I have a broken disk (with root on LVM) and lost the block(s) 
> containing the LVM partition info. I have moved the entire disk to a 
> backup (dd_rescue) but can not find the LVM partition with any tools I 
> tried (gpart, testdisk). Am I f.cked or can I still get some data of 
> these lost partitions (3 ext2/3 partitions on that LVM VG) ?
>
> -- 
> / Thomas
> .......................................................................
>  Thomas Svedberg
>  Department of Applied Mechanics
>  Chalmers University of Technology
>
>  Address: SE-412 96 Göteborg, SWEDEN
>  E-mail : Thomas.Svedberg at me.chalmers.se
> .......................................................................
>
>
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