Re: [linux-lvm] Lost free PV -> error reading VG

[Heinz Mauelshagen <mauelshagen@redhat.com>]

On Wed, Feb 18, 2004 at 05:07:08PM +0100, Stefan Jenkner wrote:
> Hi Folks!
> 
> I had a vg "debian" with the pvs /dev/hda2 /dev/hda3 /dev/hda4
> I wanted to remove /dev/hda4, so i did:  pvmove -v /dev/hda4 
> Everything went well, so I removed /dev/hda4, but _without_ the use of:
> vgreduce debian /dev/hda4 :-( 

D'oh!

> I also did: pvcreate /dev/hda4 , so /dev/hda4 seems to be an empty pv, and
> it does not know that it belongs
> to the vg "debian".

Must have been a "pvcreate -ff /dev/hda4" to achive the recreation,
while /dev/hda4 was a member of VG "debian" still.

> 
> And now, I get:
> 
> root@ttyp0[root]# vgscan 
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of
> volume group "debian" from physical volume(s)
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your volume
> group
> 
> root@ttyp0[root]# pvscan 
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- inactive PV "/dev/hda2"  is associated to unknown VG "debian" (run
> vgscan)
> pvscan -- inactive PV "/dev/hda3"  is associated to unknown VG "debian" (run
> vgscan)
> pvscan -- inactive PV "/dev/hda4" is in no VG  [23.85 GB]
> pvscan -- total: 3 [57.24 GB] / in use: 2 [33.38 GB] / in no VG: 1 [23.85
> GB]
> 
> How can I recover my vg? There are no backups :-(

/me wonders how often we mentioned to take backups of /etc/lvmconf/* yet :->

> How can I tell the vg "debian" to do not use: the empty pv /dev/hda4?
> Or, how can I tell /dev/hda4 that it belongs to the vg "debian"?
> There is no lvmconf too :-(

lvm2 tools are able to reduce VGs by missing PVs.
Fetch and build them and run "vgreduce --removemissing debian".

Afterwards continue with LVM1 (unless you want to migrate to LVM2 anyway):

# vgscan -f
# vgchange -ay

> 
> What additional information do you need to be able to help me?
> 
> Thanks
>  Stefan
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

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

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Heinz Mauelshagen                                 Red Hat, Inc.
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
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