[linux-lvm] Problems with vgreduce

[linux-lvm] Problems with vgreduce

[Marcus Hast]

Hi all,

After creating a LV I attempted to extend it with one old drive. This went
rather well. Unfortunately as I attempted to grow the FS (XFS) it detected
a bunch of read/write errors and was unable to complete. (If anyone has any
hints about this I'd be grateful as well.)

The problem is that I then tried to remove the PV from the VG by the usual
steps. (Mentioned in older posts.)  However as I try to use vgremove it
gives me the following error:

	vgreduce -- ERROR: can't reduce volume group "lvm1" by used physical
volume "/dev/hde1"

If I try to use pvmove to rectify this I instead get this error message:

	pvmove -- no logical volumes on empty source physical volume "/dev/hde1"

If I run lvdisplay I see that under the "Distribution of logical volume..."
/dev/hde1 is present with 1 in the "PE on PV" collumn. However there is no
LE written to it according to the "Logical extents" table which follows.
And according to vgdisplay the PV (/dev/hde1) is unused.

I do have one other clean disk of the same size, unused, in the same VG.
However my attempt to replace the error prone one with this clean disk have
failed. (pvmove quits in the same way.)

So it's a rather annoying situation. Does anyone have an idea of what to
try? There isn't anything relevant on the disk to be removed, but the other
disks in the LV has, so I'd rather not risk corrupting them. (Or at least
minimize the risk.)

Thanks,


Marcus Hast, Lund, Sweden, Earth.
Living long and prosperous.

Re: [linux-lvm] Problems with vgreduce

[Heinz J . Mauelshagen]

On Thu, Sep 06, 2001 at 10:45:23PM +0200, Marcus Hast wrote:
> Hi all,
> 
> After creating a LV I attempted to extend it with one old drive. This went
> rather well. Unfortunately as I attempted to grow the FS (XFS) it detected
> a bunch of read/write errors and was unable to complete. (If anyone has any
> hints about this I'd be grateful as well.)
> 
> The problem is that I then tried to remove the PV from the VG by the usual
> steps. (Mentioned in older posts.)  However as I try to use vgremove it
> gives me the following error:
> 
> 	vgreduce -- ERROR: can't reduce volume group "lvm1" by used physical
> volume "/dev/hde1"
> 
> If I try to use pvmove to rectify this I instead get this error message:
> 
> 	pvmove -- no logical volumes on empty source physical volume "/dev/hde1"
> 
> If I run lvdisplay I see that under the "Distribution of logical volume..."
> /dev/hde1 is present with 1 in the "PE on PV" collumn. However there is no
> LE written to it according to the "Logical extents" table which follows.
> And according to vgdisplay the PV (/dev/hde1) is unused.
> 
> I do have one other clean disk of the same size, unused, in the same VG.
> However my attempt to replace the error prone one with this clean disk have
> failed. (pvmove quits in the same way.)
> 
> So it's a rather annoying situation. Does anyone have an idea of what to
> try?

Yep, I think so.

Your messy metadata contents seem to be caused by the io errors you metioned.

You should still have a valid metadata backup in /etc/lvmconf/ which contains
your configuration *before* you added hde1.
Please find it using

"for f in /etc/lvmconf/*conf; do vgcfgrestore -ll -f /etc/lvmconf/$f;done"

and restore it to all PVs which where in the VG before hde1 was added.

"vgscan;vgchange -ay" should give you a valid configuration back afterwards.

Please rememer to take backups of your data!

Regards,
Heinz    -- The LVM Guy --



> There isn't anything relevant on the disk to be removed, but the other
> disks in the LV has, so I'd rather not risk corrupting them. (Or at least
> minimize the risk.)
> 
> Thanks,
> 
> 
> Marcus Hast, Lund, Sweden, Earth.
> Living long and prosperous.
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

*** 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
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