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* [linux-lvm] Erroneously formatted PV; 'vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group'...
@ 2003-02-11 18:44 Tim-Patrick Märk
  0 siblings, 0 replies; 3+ messages in thread
From: Tim-Patrick Märk @ 2003-02-11 18:44 UTC (permalink / raw)
  To: linux-lvm

Heinz,

thank you very much!

I built a kernel with LVM2/ device-mapper (and XFS) on my emergency
system and ran 'vgscan' and 'vgchange --partial -a y' as you said.
The LVs were mounted read-only, so I copied the root-LV to another
partition (ext2), booted it and restored the old LVM metadata using
'vgcfgrestore'.
Some "minor" problems (related to properly patching the kernel etc.)
occured during this process, but all in all it worked well and now I'm
very happy to have my data back :)!

Tank you again!


> 
> 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" a=
> fter
> 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 --
> 
> 
> *** Software bugs are stupid.
>     Nevertheless it needs not so stupid people to solve them ***
> 
>
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-
=3D=
>
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D
-=
> =3D-=3D-
> 
> Heinz Mauelshagen                                 Sistina Software
Inc.
> Senior Consultant/Developer                       Am Sonnenhang 11
>                                                   56242 Marienrachdorf
>                                                   Germany
> Mauelshagen@Sistina.com                           +49 2626 141200
>                                                        FAX 924446
>
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-
=3D=
>
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D
-=
> =3D-=3D-

^ permalink raw reply	[flat|nested] 3+ messages in thread
* [linux-lvm] Erroneously formatted PV; 'vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group'...
@ 2003-02-09 12:55 Tim-Patrick Märk
  2003-02-10  7:47 ` Heinz J . Mauelshagen
  0 siblings, 1 reply; 3+ messages in thread
From: Tim-Patrick Märk @ 2003-02-09 12:55 UTC (permalink / raw)
  To: linux-lvm

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

^ permalink raw reply	[flat|nested] 3+ messages in thread
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2003-02-11 18:44 [linux-lvm] Erroneously formatted PV; 'vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group' Tim-Patrick Märk
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2003-02-09 12:55 Tim-Patrick Märk
2003-02-10  7:47 ` Heinz J . Mauelshagen

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