[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]

Hello,

yesterday 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.

Tanks in advance

Tim-Patrick Märk
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