[pve-devel] some news for snapshots

Alexandre DERUMIER aderumier at odiso.com
Mon Aug 27 11:17:42 CEST 2012


>>A snapshot must include full VM state! 
What is the benefit ? 
Rollbacking a snapshot and start the vm with memory at the point of the snapshot ?

If the datas are correctly flushed, I don't see the benefit vs restarting the vm with zero memory.

If I have vm with 64GB of memory, I don't want 10min of downtime to take the snasphot.
(I don't want to have any vm interruption to take the snasphot)






----- 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 10:54:05 
Objet: RE: [pve-devel] some news for snapshots 

> >>AFAIK, you can already create a snapshot of COW2 files using 'savevm' 
> command. 
> >>So I think the basic code must be there? It is just not implemented 
> >>inside the 'blockdev-snapshot-sync' command. 
> 
> Yes, but savevm pause the vm and make a full snapshot (include 
> memory,etc..), and It can take several minutes if you have big memory vm. 

Sorry, but 'blockdev-snapshot-sync' also does that (at least it should do that). 
A snapshot must include full VM state! 

> I'll do some tests with savevm today to see how it's works. 

great! 




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Alexandre D e rumier 

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