[pve-devel] some news for snapshots

Alexandre DERUMIER aderumier at odiso.com
Tue Aug 28 03:44:45 CEST 2012


Yes, that's stupid indeed. Need to wait for patch to copy from children to parent.
(I think It'll be ready for kvm 1.3)



----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Lundi 27 Août 2012 19:06:40 
Objet: RE: [pve-devel] some news for snapshots 

> >>I mean I see the problem with backup, but external hnapshot has much 
> >>more problems, because you need to do a merge after the backup? 
> 
> Yes,we need to merge if we want to delete the snapshot after the backup. 
> and now, this is from parent to children. 

But this is simply not practical - copying the whole image is totally stupid! 

> > By making the snapshot-file argument of the monitor and QMP command 
> > optional, that could be used as a request to make the snapshot 
> > internally instead of to an external file. 
> 
> so this is using the blockdev-snapshot-sync without file argument to do 
> snapshot internal, in the current qcow2. 
> I talk with qemu mailing, this is not planned for now. 
> 
> >> However, without live block migration of an 
> > internal snapshot, there is no way to make a backup of an internal 
> > snapshot while still leaving the VM running, so this feature is not 
> > planned at the present. For now, the snapshot-file argument is 
> > required, and only external snapshots are implemented. 
> 
> Yes, indeed with external snapshot, we can backup the parent file. 
> This is good for backup only I think. 

No, we can't use external snapshot for backup, because the merge afterwards is simply not practical. 




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Alexandre D e rumier 

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