[linux-lvm] Changing partition names? [vgscan not seeting PV]
Joe Thornber
thornber at btconnect.com
Tue Jul 31 09:36:12 UTC 2001
On Tue, Jul 31, 2001 at 10:06:26AM +1200, Donald Gordon wrote:
> On Tue, 31 Jul 2001, Donald Gordon wrote:
>
> > On Mon, 30 Jul 2001, AJ Lewis wrote:
> >
> > > On Mon, Jul 30, 2001 at 11:48:56PM +1200, Donald Gordon wrote:
> > > > I can't seem to see any way to tell lvm that the name of one of the
> > > > partitions it is using has changed (from /dev/sda10 to /dev/sda8; I'm
> > > > transitioning a system to LVM). Should it pick this up on reboot or is
> > > > there some config file I need to prod?
> > >
> > > vgscan will do this for you automatically.
> > >
> >
> > When I (ahem) remove a partition by mistake and re-create it in the same
> > location with fdisk vgscan no longer recognises it.
>
> I can't see anything particularily odd about this partition BTW; I'm not
> sure what a LVM superblock is supposed to look like but what's there
> *seems* to be likely to be something. Is the partition table supposed to
> have some sort of flag in it (apart from the type=0x8e) saying "I'm an LVM
> PV" or is it likely the data (my /usr and /home :( ) in the PV is gone
> forever?
Your data should still be there, I've done a similar thing and still
managed to recover it. Just don't write anything to that device. Try
experimenting with the pvdata command on your suspect partition.
>
> If it makes sense to anyone, the first 4kb (and 512kb is in the same
> directory) of that partition is at http://fias.co.nz/lvm/sda6-4k
I just had a look, it certainly doesn't look like a pv. So either the
metadata got fried, in which case you should restore from a backup.
Or you didn't restore the partition to the same location, in which
case dump a bit more of the partition, and hunt for strings that match
the names of your vg and lv's.
- Joe
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