[linux-lvm] Doubled PV

Heinz J . Mauelshagen mauelshagen at sistina.com
Tue May 27 06:11:02 UTC 2003


what _exactly_ happened during the pvmove ?
Would help to analyze any pvmove bug.

Using LVM2 tools is a good idea.

You'll have text metadata that way, would be able to hand-edit it removing
the 10 LEs and vgcfgrestore the changed metadata back onto the PVs.

On Thu, May 22, 2003 at 01:50:43AM +0200, Markus Schiltknecht wrote:
> Hello everybody
> I just read that it's not recommended to run LVM on top of Softraid
> devices. Why is that? Looks like a perfect combination to me.
> However. Recently two (?!?) disks of a RAID5 device got bad sectors. The
> RAID array stopped immediately. Recreating the RAID with 'mkraid -R', I
> could save most of its data. I did move it away with 'pvmove'.
> Then - only 10 PE remaining on the bad PV - I decided to use 'pvmove -i'
> to remove those faulty PE's. That worked. But now my VG is in a silly
> state: because 'pvmove' touched the bad sectors, the RAID shut down,
> i.e. the whole PV (/dev/md/20) was no longer writeable nor readable. So
> pvmove couldn't write to /dev/md/20, not even LVM metadata in an intact
> area.
> Now /dev/md/20 is still registered as part of myVG. Aktivating it again
> with 'mkraid -R /dev/md20' I can pvdisplay on it and all metadata seems
> okay, but like before the 'pvmove -i'. Those 10 LE's are still on there.
> 'vgscan -v' outputs the following, somewhat silly message:
> vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
> vgscan -- creating empty "/etc/lvmtab" and "/etc/lvmtab.d"
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- scanning for all active volume group(s) first
> vgscan -- reading data of volume group "myVG" from physical volume(s)
> vgscan -- only found 6561 of 6551 LEs for LV /dev/myVG/data (2)
> vgscan -- ERROR "vg_read_with_pv_and_lv(): allocated LE of LV" can't get
> data of volume group "myVG" 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
> That's exactly 10 LEs too much!
> I don't mind too much about the data in those 10 LEs. But I would like
> to be able to activate myVG again!
> How can I tell it, to forget about /dev/md/20? Do I have to use LVM2
> tools? I've read through the mailing list, but didn't find the proper
> tool / command.
> Thanks for your help
> Markus
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


Heinz    -- The LVM Guy --

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


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446

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