Re: [Xen-users] Fw: coordinating VM snapshot with LVM snapshot.

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jan 12, 2010 at 05:44:18PM -0800, J Nb wrote:
> Anyone ?
> 

Now that XenServer is opensourced as XCP (Xen Cloud Platform), you could
take a look at the source.. 

I believe XenServer supports Windows VSS coordination for snapshots.
"xe vm-snapshot-with-quiesce"

-- Pasi

> -nb
> 
> --- On Sun, 1/3/10, J Nb <j_nwb@xxxxxxxxx> wrote:
> 
> > From: J Nb <j_nwb@xxxxxxxxx>
> > Subject: coordinating VM snapshot with LVM snapshot.
> > To: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Date: Sunday, January 3, 2010, 6:17 PM
> > Hi
> >    How to co-ordinate VM snapshots and disk
> > snapshots ? Here is a sequence I am thinking of
> > automating...
> > 
> >   1.Tell VM to sync (say via ssh or some special
> > agent)
> >      * This will do "sync" and any
> > application specific hook to make it quiescent.
> > 
> >   2. Tell VM/Hypervisor to flush all disk buferes
> > ?  (HOW ??? )
> >      * Anything at this level?
> > 
> >   3. Pause the VM
> > 
> >   4. xm save -c (To save the VMs state in to
> > checkpoint file.)
> >       (This may take more time !)
> > 
> >   5. Take LVM snapshot for each disk. 
> > 
> >   6. Unpause the VM
> > 
> >   7. Application level resume if any.
> >   
> >   7. Use the snapshot to copy each disks ?!!!! (either
> > dd or mount followed by cp/rsync)  (This can be big!
> > Any optimization suggestions )   
> > 
> >   8. discard snapshot.
> > 
> > 
> > Would the above sequence work ? 
> > 
> > Any suggestions on individual steps ?
> > 
> > Anything specific for PV and HVM virtual machines?
> > 
> > Is there a backdoor to qemu-dm console ?
> > 
> > Does anyone know how similar functionality is implemented
> > in XenServer product or Virtual Iron or anyone else? 
> > 
> > -nb
> > 
> > 
> >       
> > 
> 
> 
> 
> 
> 
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