[linux-lvm] lvm amnesia (Incorrect metadata area header checksum)

[linux-lvm] lvm amnesia (Incorrect metadata area header checksum)

[Dave Scott]

Hi all,

I have a RAID5 array that lost a disk during an upgrade to Fedora Core8.

After the upgrade, only parts of the array made it back up. I removed
the disk from the array and replaced it and the rebuilding process began
(and finished).

If I 'cat' the device, I can see that my data is still there (whew).

But, the physical volume, the (single) volume group, and the logical
volumes (3) did not seem to be there any more.

'pvscan' showed no pv's, so I recreated 'pv0' using the uuid from the VG
archive file, a la:

# pvcretae --force --uuid "sbqK9..." --restorefile
/etc/lvm/archive/raid5a_00007.vg pv0

Now, 'pvscan' spits out three 'Incorrect metadata area header checksum'
messages and the PV data. I.e.,

# pvscan
Incorrect metadata area header checksum
Incorrect metadata area header checksum
Incorrect metadata area header checksum
PV /dev/md1        lvm2 [255.89 GB]
Total: 1 [255.89 GB] / in use: 0 [0   ] / in no VG: 1 [255.89 GB]
# vgscan -v
  Wiping cache of LVM-capable devices
  Wiping internal VG cache
Reading all physical volumes.  This may take a while...
  Finding all volume groups
Incorrect metadata area header checksum
# lvscan -v
  Finding all volume groups
Incorrect metadata area header checksum
#
 
I have the archive file and the data. How do I get the lvm to see it
once again?

Please, please help...   :(

If you need more info, let me know. I've got little else to try.

--dave;

Re: [linux-lvm] lvm amnesia (Incorrect metadata area header checksum)

[Alasdair G Kergon]

On Mon, Dec 03, 2007 at 07:02:03PM -0700, Dave Scott wrote:
> I have the archive file and the data. How do I get the lvm to see it
> once again?

add a 'vgcfgrestore' after the pvcreate
 
Alasdair
-- 
agk@redhat.com

RE: [linux-lvm] lvm amnesia (Incorrect metadata area header checksum)

[Dave Scott]

Thanks for your response, Alasdair.

But, it didn't work (unless I have the options wrong). Here's the
output:

# vgcfgrestore -v -f /etc/lvm/backup/raid5a raid5a
  Incorrect metadata area header checksum
  Incorrect metadata area header checksum
    Fixing up missing format1 size (255.89 GB) for PV /dev/md1
  Incorrect metadata area header checksum
  Restore failed.
#

--dave;

> -------- Original Message --------
> Subject: Re: [linux-lvm] lvm amnesia (Incorrect metadata area header
> checksum)
> From: Alasdair G Kergon <agk@redhat.com>
> Date: Mon, December 03, 2007 5:31 pm
> To: LVM general discussion and development <linux-lvm@redhat.com>
> 
> 
> On Mon, Dec 03, 2007 at 07:02:03PM -0700, Dave Scott wrote:
> > I have the archive file and the data. How do I get the lvm to see it
> > once again?
> 
> add a 'vgcfgrestore' after the pvcreate
>  
> Alasdair
> -- 
> agk@redhat.com
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/