On Wed, Oct 12, 2011 at 11:25 AM, Toby Corkindale 
<toby.corkindale@strategicdata.com.au> wrote:
I don't think that is the right conclusion.
What is the output of running:
sudo fdisk -l /dev/sdg
Disk /dev/sdg: 2000 GB, 2000396321280 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System 
/dev/sdg1               1       60800   488375968   8e  Linux LVM
Warning: Partition 1 does not end on cylinder boundary.                   
/dev/sdg2           60800      243202  1465144065   fd  Lnx RAID auto
Warning: Partition 2 does not end on cylinder boundary.  
 
sudo pvdisplay -m
root@ubuntu:~# pvdisplay -m
  "/dev/sdg1" is a new physical volume of "465.74 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdg1
  VG Name               
  PV Size               465.74 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               okjC2x-EKtY-8Tf7-gkqN-Q7Oj-Kixj-8aTZ2T
 
sudo vgdisplay
root@ubuntu:~# vgdisplay 
  No volume groups found
I've been getting some help in #lvm on freenode.
I've backed up my lvm header on /dev/sdg1, and looked at it, and found old(er) configurations still present.
From this, I was able to vgcfgrestore -f /bakupcfg system and see my volumes again.
However, they were bunk ... I'm guessing the configuration I restored didn't accurately describe the layout, so instead of filesystems, it just found "data" according to file -s.
In the meantime, have restored the original header.
More ideas are always welcome.
cheers,
     / Brett