[linux-lvm] Instability with 2.6, recovering (meta)data?

[Toad]

With agk's help, I eventually found that this worked:
vgcfgrestore vg-big -M1 -f /etc/lvm/archive/vg-big_00003.vg

However, the LV that I deleted that originally caused the problem,
/dev/vg-big/slowtemp (~ 10GB), doesn't exist, and yet it's space usage 
appears to still be used:
root at amphibian:~# vgdisplay
...
VG Size               212.81 GB
PE Size               32.00 MB
Total PE              6810
Alloc PE / Size       6704 / 209.50 GB
Free  PE / Size       106 / 3.31 GB

As I was originally trying to free up enough space to vgmove off one of
the disks, in order to replace it and then vgmove off another of the
disks (IDE madness...), this is still a problem.

On Sun, Nov 09, 2003 at 09:38:21PM +0000, Toad wrote:
> Each time I have deleted an LV on LVM2 on 2.6, it has corrupted my
> metadata. Last time I did a vgcfgrestore on 2.4 and it worked, however I
> have recently been bitten by some sort of incompatibility bug and my LVM
> now only works on 2.6 (it might work on a 2.4+devmapper kernel, I'll
> look into that). Here is what happens when I try to get my metadata
> back:
> root at amphibian:/usr/src/linux# vgdisplay -d -v
>     Finding all volume groups
>     Finding volume group "vg-big"
>   invalid lv in extent map
>   Couldn't fill logical volume maps.
>   Volume group "vg-big" doesn't exist
> root at amphibian:/usr/src/linux# pvscan -d -v
>     Wiping cache of LVM-capable devices
>     Wiping internal cache
>     Walking through all physical volumes
>   invalid lv in extent map
>   Couldn't fill logical volume maps.
>   No matching physical volumes found
> root at amphibian:/usr/src/linux# vgcfgrestore -v -d vg-big
>   PV /dev/hda is a different format (lvm1)
>   Restore failed.
> 
> That last one is particularly perverse; I was always told that LVM1 and
> LVM2 are compatible. Of course later I discovered this not to be the
> case; after some operation or other (creating an LV? resizing one?) on
> LVM on 2.6, I could no longer access my LVs under 2.4/LVM1.
> 
> Any help?
> -- 
> Matthew J Toseland - toad at amphibian.dyndns.org
> Freenet Project Official Codemonkey - http://freenetproject.org/
> ICTHUS - Nothing is impossible. Our Boss says so.



-- 
Matthew J Toseland - toad at amphibian.dyndns.org
Freenet Project Official Codemonkey - http://freenetproject.org/
ICTHUS - Nothing is impossible. Our Boss says so.