Re: [Maybe Spam] LVM questions (RHEL3) and considerations for LVM2 (in future RHEL4?)

[Alasdair G Kergon <agk redhat com>]

On Wed, Jun 09, 2004 at 04:43:54PM -0400, Al Tobey wrote:
> The upgrade from LVM1 to LVM2 has been flawless for me.  I've only ever
> had trouble with going back to LVM1 after running LVM2 on a VG.

If a VG began as LVM1, and you use LVM2 with it, you should be able
to return to using LVM1 provided you haven't changed it to use any 
LVM2-only features that LVM1 doesn't support.
(There were some bugs in earlier versions of LVM2 affecting 
compatibility though.)
 
Snapshots are also implemented differently in LVM1 and LVM2 - you should
delete them before switching.

> I believe LVM2 is only command-line.   I believe you can mix & match
> your use of the EVMS and LVM2 tools at will, since they both use the
> device-mapper backend.

EVMS does not support the new LVM2 on-disk format yet, so provided you
continue using lvm1 metadata under LVM2 (e.g. don't run vgconvert).
 
Alasdair
-- 
agk redhat com