Re: [Qemu-devel] [RFC] qemu snapshot enchancement

[Stefan Hajnoczi]

On Fri, Jan 25, 2013 at 09:34:28AM +0000, Dietmar Maurer wrote:
> > > Note: The proposed backup patches (already sent to the list) make
> > > backups without creating internal/external snapshot. Consistency is
> > guaranteed by using COW.
> > >
> >    I guess this can be implemented, or may already exist in 3rd party
> > components, such as LVM2. 
> 
> We used LVM to provide snapshots for backups for more than 4 years now.
> (in production at many customer sites).
> 
> It is a constant PITA. If interested, you can grab our support forum about 
> problems
> with LVM snapshots (http://forum.proxmox.com).
> 
> The new backup approach is much better an avoids most of the problems we had.
> (the backup patches contains a list of advantages).

Hi Dietmar,
If you've been using it for 4 years then it was without dm-thin, which
is a new snapshot mechanism that solves limitations of classic LVM
snapshot volumes.  So if you're referring to inefficient LVM snapshots
then that should be solvable now.

Or is LVM a pain for other reasons?

Stefan