Re: [linux-lvm] pvmove killed vg

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

Gunther,


you need to run vgcfgrestore on *all* PVs which where in your vg0 *after*
running "pvcreate -ff" on them. YOu can find out which these where by
"vgcfgrestore -ll -n vg0 -f /etc/lvmconf/WhateverYourRecentBackupFileIs".

If that doesn't work a hack to activate it anyway without running vgscan is
to copy /etc/lvmconf/WhateverYourRecentBackupFileIs (I assume
/etc/lvmconf/vg0.conf.cd in your case) to /etc/lvmtab.d/vg0,
"echo -en 'vg0\0vg1\0' > /etc/lvmtab" and "vgchange -ay".
Create a dummy LV with 1 PE afterwards and your 
metadata on all PVs of the VG should be ok again.

Remember to back /etc/lvmconf/ regularly when you change your LVM configuration!

Regards,
Heinz    -- The LVM Guy --


We recommend to upgrade to LVM 1.0.1 because a couple of bugs (some related to
pvmove) have been fixed.
On Tue, Dec 11, 2001 at 10:34:24PM +0100, gunther.kuhlmann@web.de wrote:
> Hi,
> 
> I've got a broken lvm vg as a result of an unsuccessful pvmove
> command. My system is a SuSE 7.0 with kernel 2.4.4 and
> lvm-0.9.1_beta7-10. 
> 
> The vg spans several partitions on one disks, one of which I 
> wanted to evacuate. I used the pvmove command with chunks of 
> 32 PE (= 1 GB); 10 GB total. The first 8 chunks worked okay,
> but the 9th (pvmove -v /dev/hda8:256-287 /dev/hda10) fell over
> with error code 23 while moving the fifth PE. So I checked using
> pvdisplay that the four PE had indeed been moved. A further
> attempt with pvmove -v /dev/hda8:260-287 /dev/hda10 fell over as
> well, again error code 23. (That's error moving physical
> extent(s)). 
> 
> I then rebooted the machine which killed the complete volume
> group. Which in turn did not quite impress me. :-((
> 
> During my attempts at recovering I think I did a vgscan, which
> found the vg "vg1" on /dev/hdb, but not the vg "vg0" on /dev/hda.
> 
> I tried the following commands unsuccessfully:
> - vgcfgrestore -v -n vg0: please enter physical volume name (the
>   synopsys of vgcfgrestore did not state it as a mandatory 
> parameter)
> - vgcfgrestore -v -n vg0 /dev/hda10: can't restore part of active
> volume grout vg0
> - vgcfgrestore -v -n vg0 /dev/hda{6,7,8,10}: please enter physical
> volume name
> - vgchange -a n vg0: volume group vg0 does not exist
> - vgchange -a y vg0: volume group vg0 does not exist
> 
> I still have the file /etc/lvmconf/vg0.conf.cd as well as the
> devices /dev/vg0/lv0{0,1,2,3} and /dev/vg0/group. (And
> /dev/vg1/..., but that is working.)
> 
> Any suggestions on how I can recover the data would be highly
> appreciated. I found a reference to a program called
> uuid_fixer/uuid_editor, but usage was discouraged. Do I have to 
> try it
> or is there a better way? Does upgrading to a newer version of lvm
> help? Or do I have to update the kernel as well then? And I 
> definately
> do _not_ want to kill my other vg as well.
> 
> Regards,
> 
> Gunther
> 
> 
> 
> 
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*** 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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