Trying to recover 20TB LVM2 on Linux md

How to use TestDisk to recover lost partition
Post Reply
Posts: 1
Joined: 28 Aug 2012, 16:49

Trying to recover 20TB LVM2 on Linux md

#1 Post by rickatnight11 » 28 Aug 2012, 16:55

I've had an issue with a corrupted checksum on a single drive in my raid-6 md after every reboot. Following some instructions online, I stopped the array and recreated it with the --assume-clean option. The md created fine (although after reboot the drive still demonstrates a corrupted checksum, so I think the drive is borked), but the partition table on it is gone. I'm really hoping my data isn't gone.

When I run testdisk, it does immediately find an LVM2 partition in Quick and Deep scans, and while it and the md are both 20TB/18TiB, it says the hard-drive is too small:

Code: Select all

Disk /dev/md0 - 20 TB / 18 TiB - CHS 4883782460 2 4                                                                                   
The harddisk (20 TB / 18 TiB) seems too small! (< 23 TB / 21 TiB)                                                                     
Check the harddisk size: HD jumpers settings, BIOS detection...                                                                       
The following partitions can't be recovered:                                                                                          
     Partition               Start        End    Size in sectors                                                                      
  Linux LVM              512   0  1 588815615   1  4 39070259200
The fact that it can see the partition gives me hope that my data isn't gone, but I'm not sure what to do at this point.

Sponsored links

User avatar
Site Admin
Posts: 3403
Joined: 18 Feb 2012, 15:08
Location: Le Perreux Sur Marne, France

Re: Trying to recover 20TB LVM2 on Linux md

#2 Post by cgrenier » 01 Sep 2012, 08:01

There is no partition table on LVM2.
What is the results of
- pvdisplay
- vgdisplay
- lvdisplay

Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests