Re: [Qemu-devel] Re: KVM call minutes for June 8

[Luiz Capitulino <lcapitulino@redhat.com>]

On Thu, 10 Jun 2010 09:27:34 -0500
Anthony Liguori <anthony@codemonkey.ws> wrote:

> On 06/10/2010 08:08 AM, Kevin Wolf wrote:
> > Am 10.06.2010 14:53, schrieb Anthony Liguori:
> >    
> >> On 06/10/2010 04:43 AM, Kevin Wolf wrote:
> >>      
> >>> Huh, why this? Seems I still haven't understood all of qcow2 then... I
> >>> always thought that there's just a specific offset where VM state
> >>> starts, but no explicit end.
> >>>
> >>>        
> >> A live snapshot can last for a very long time.  What happens if you need
> >> to allocate a new block for disk I/O while saving a snapshot?
> >>      
> > You allocate it, I guess?
> >
> > Note that VM state must be virtually contiguous, but not necessarily
> > physically (virtually = on the virtual hard disk as seen by the guest;
> > physically = in the image file). It's just not seen by the guest because
> > it's saved at a high offset that is after the end of the real disk
> > content, but otherwise it should behave the same as guest data.
> >    
> 
> I guess you could just start writing and then once your finished, you 
> could update the snapshot information.  So yeah, I think your right that 
> it's doable with the current format.

 No more issues on having them in QMP for 0.13 then?