[linux-lvm] LVM problem - how to recover?
Richard Kampmann
Richard.Kampmann at freenet.de
Tue Nov 28 20:15:09 UTC 2006
Hi everybody ...
I recently had a lvm crash from which I now have to recover. So now I need
your help ...
The system is a SUSE 10.1 system with actual patches.
# uname -rio
2.6.16.21-0.25-default i386 GNU/Linux
# lvm version
LVM version: 2.02.02 (2006-02-07)
Library version: 1.02.03 (2006-02-08)
Driver version: 4.5.0
#
There was the unenlightened crash and before there was a volume goup spanning
two physical partitions (sda2, sdb2), each on one physical disk (sda, sdb).
The system froze (maybe in coincidence with some snapshot-handling) and I had
to press the reset button. When rebooting lvm told me he could not open the
volume group because one pv was missing. The partition looked OK when
checking the partition table. I tried several things - and to do a
vgcfgrestore but it did not help.
The volume group (system_vg) contained the root partition, so I installed a
new system on a third disc and tried to recover the old volume group.
Unfortunately when doing the pvcreate for the two physical volumes I did NOT
choose the "--zero n" switch.
Fact is: I now have the volume group containing two physical discs and two
physical volumes with the correct PV UUIDs. But the first sectors are zeroed,
aren't they?
Any way to recover the LVs of the old volume group? A vgcfgrestore (YES, there
was a vgcfgbackup before!) does not work ... bad luck.
Ah - and all logical volumes contain Reiser Filesystems V 3.6 - they MUST
still be there ...
So - what could be my next steps?
Bye
Richard Kampmann
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