Re: [linux-lvm] restoring volume group from file

[James W Anderson <jwa@mit.edu>]

Thanks for responding.

vgck seems to say that things are alright:

# vgck /dev/vg00
vgck -- VGDA of "vg00" in lvmtab is consistent
vgck -- VGDA of "vg00" on physical volume is consistent

I also did try to restore all of the old metadata backups, but to no
avail.

Do you have any other suggestions?  I still do not understand why
vgcfgrestore say that the sizes are different, since I did a
block-by-block copy from the original partition.

Thank you again for your help.

On Fri, Apr 25, 2003 at 11:21:24AM +0200, Heinz J . Mauelshagen wrote:
> 
> James,
> 
> sounds like you had a problem with your LVs before you copied already,
> which I assume was the reason to copy hde5 and run vgcfgrestore.
> 
> What does vgck (metadata checker) display ?
> 
> Maybe you have better luck with an older metadata backup from
> /etc/lvmconf ?
> 
> On Thu, Apr 24, 2003 at 12:39:42PM -0400, James W Anderson wrote:
> > Hi,
> > 
> > I recently made a copy of an lvm partition to a file, using dd:
> > 
> > dd if=/dev/hde5 of=lvm-file bs=...
> > 
> > I would now like to mount this file, which contains a single volume
> > group, on a different machine.  Here is what I have done so far:
> > 
> > 1) create a loopback device for the file
> > 
> > # losetup /dev/loop0 lvm-file
> > 
> > 2) pvscan, detects the volume group
> > 
> > # pvscan
> > pvscan -- reading all physical volumes (this may take a while...)
> > pvscan -- inactive PV "/dev/loop0" of VG "vg00" [23.45 GB / 3.20 GB free]
> > pvscan -- total: 1 [23.46 GB] / in use: 1 [23.46 GB] / in no VG: 0 [0]
> > 
> > 3) Now, when I try to do vgcfgrestore, I get the following error:
> > 
> > # vgcfgrestore -n vg00 -f vg00.conf -o /dev/hde5 /dev/loop0
> > vgcfgrestore -- size of physical volume /dev/loop0 differs from backup
> > 
> > 
> > I tried passing the -i option to tell it to ignore the size
> > difference, and then it did create the volume group, but all of the
> > logical volumes are unusable---e2fsck cannot find the superblocks on
> > the filesystems.
> > 
> > Does anyone have any suggestions as to what I might try to get this to
> > work?  Any help would be tremendously appreciated.
> > 
> > Many thanks,
> > James
> > 
> >