Re: [linux-lvm] Erroneously formatted PV; 'vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group'...

["Heinz J . Mauelshagen" <mauelshagen@sistina.com>]

Tim-Patrick,

with your root on LV setup you either need:


an emergency boot media with LVM1 on it _and_ /etc/lvmconf/* backup in
order to restore you LVM metadata using vgcfgrestore presuming you setup
your partitions exactly the way they were before ("vgscan;vgchange -ay" after
metadata restore)

- or -

an emergency boot media with LVM2/device-mapper on it to
run "vgscan ; vgchange --partial -a y" in order to
access your partioal VG without the gone partition

- or -

that LVM2 boot media to restore the metadata.

- or -

to attach your HDDs to another LVM equipped system to repair the
volume group configuration

Regards,
Heinz    -- The LVM Guy --


On Sun, Feb 09, 2003 at 07:53:56PM +0100, Tim-Patrick Märk wrote:
> Hello,
> 
> two days ago i installed a new HDD and added it to my VG 'vg1'
> (partition id '8e' + 'pvcreate /dev/hdb1' + 'vgextend vh1 /dev/hdb1').
> A bit later I erroneously formatted '/dev/hdb1' by 'mkfs.xfs /dev/hdb1'.
> I ran 'vgscan' and 'pvscan' and the made a smiliar output like it is
> shown on
> http://lists.sistina.com/pipermail/linux-lvm/2002-August/011947.html -
> but i have only two PVs in my VG 'vg1': '/dev/hdc1' and '/dev/hdd2'.
> I don't remember what i exactly did with '/dev/hdb' after that (it was
> late...), but as a result I 'fdisked' the partition table away...
> There was no data on '/dev'hdb' (except the LVM metadata), so no 'real'
> data needs to be recovered (at least i hope so).
> 
> All in all, I can't access the VG 'vg1' (PVs: '/dev/hdc1' + '/dev/hdd2')
> with the 3 LVs 'root', 'storage' and 'swap' any more. 
> 
> Now you could advise me to run 'vgcfgrestore', but i regretfully must
> say that i rebooted my box and as the name of the LV 'root' implies, my
> root-filesystem was on it, so the system doesn't boot anymore *doh*...
> 
> Summary:
> - 1 VG: 'vg1'
> - 2 (3) PVs: '/dev/hdc1' + '/dev/hdd2' + for a short time (see above)
> '/dev/hdb1'
> - 3 LVs: 'root', 'storage' and 'swap'
> - Filesystem on all LVs: XFS
> 
> Fortunately i have a separated 'backup system' on another HDD, which
> doesn't use LVM nor XFS, but simply ext2, so i can work with it
> temporarily to fix this disaster.
> 
> I think the problem is, that the VG 'vg1' still thinks, it would consist
> of 3 PVs, but only 2 are there.
> But because no VG is found by 'vgscan' (see link above), i can't remove
> '/dev/hdb1' by 'vgreduce vg1 /dev/hdb1' and so on...
> 
> Is there any way to generate metadata for '/dev/hdb1' to make it known
> by 'vg1' or remove '/dev/hdb1' from 'vg1'?!
> 
> I'm very despaired and would be gladdened by every answer.
> If you need any details, just ask.
> 
> P.S.: This is not intended to be a cross-posting; I only had problems
> submitting my first one.
> 
> Kind regards and thanks in advance
> 
> Tim-Patrick Märk
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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