[linux-lvm] LVM recovery

[Melinda Taylor]

Ok I have installed LVM2 with readline support and I tried:

lvm> vgchange --partial -a y
  Partial mode. Incomplete volume groups will be activated read-only.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  2 PV(s) found for VG vg01: expected 4
  Logical volume (lv02) contains an incomplete mapping table.
  4 logical volume(s) in volume group "vg01" now active
  2 logical volume(s) in volume group "vg02" now active

I then tried to mount my VG with the missing PV's (VG01) with the line 

[root at astro root]# mount -o ro /dev/vg01/lv03 /home2
mount: wrong fs type, bad option, bad superblock on /dev/vg01/lv03,
       or too many mounted file systems


and I see the following in /var/log/messages:

Jul 21 11:53:48 astro kernel: EXT3-fs: INFO: recovery required on readonly
filesystem.
Jul 21 11:53:48 astro kernel: EXT3-fs: write access unavailable, cannot proceed.
Jul 21 11:53:48 astro kernel: EXT2-fs: device-mapper(254,4): couldn't mount
because of unsupported optional features (4).

Anyone have any ideas on this one? I am getting closer I guess. I just want to
grab the data off the remaining 2 LV if possible.

Many Thanks,

melinda







Quoting Emmanuel Varagnat <emmanuel.varagnat at free.fr>:

> Melinda Taylor wrote:
> 
> > - vgscan
> > vgscan -- reading all physical volumes (this may take a while...)
> > vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> > vgscan -- WARNING: This program does not do a VGDA backup of your volume
> > group
> > - pvcreate /dev/sda2 ; pvcreate /dev/sdb1; pvcreate /dev/sdc2; pvcreate
> > /dev/sdd2
> > - vgcreate vg01 /dev/sda2 /dev/sdb1 /dev/sdc2 /dev/sdd2
> > - check no of LE pvdata -E /dev/sdc2 (5710 LE)
> >  lvcreate -l 5711 -n lv03 vg01 /dev/sdc2
> > - Make ext3 fs on each LV
> >  mkfs.ext3 /dev/vg01/lv01
> > 
> > /dev/sda2 and /dev/sdb1 are kaput (both drives died within days of
> > eachother).
> > 
> > I believe I had 4 logical volumes.
> 
> I would say that it can depend on what is the block allocation policy of 
> the LVM system...
> 
> > So I presume this means each LV resided on a separate drive and probably
> > lv01 and lv02 were the 2 on the 2 dead disk drives.
> > 
> >     * PVs on four SCSI devices
> >     * A VG called "vg01" comprised of said PVs
> > 
> > If I reinstall lvm on my newly installed system can I recover lv03 and
> > lv04?
> 
> You should try LVM2 that can deal with partial/truncated volumes.
> 
> -=( manu )=-
> 
> 
> 
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