[pve-devel] some news for snapshots

Alexandre DERUMIER aderumier at odiso.com
Mon Aug 27 15:08:43 CEST 2012


>>Sorry, but we simply need to restore full state. Users expect that (this is well known 
>>behavior on other products).
I don't think if it's possible with storage other than qcow2 (rbd,sheepdog,nexenta or external san).

also external snapshots are only disk snapshot without the vmstate.

I see in vmware doc:
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc_50%2FGUID-878C36BA-6922-4269-8803-7FC419B947B7.html
that memory snapshot is optionnal

"
Procedure
1
Select Inventory > Virtual Machine > Snapshot > Take Snapshot.
2
Type a name for the snapshot.
3
Type a description for the snapshot.
Adding a date and time or a description, for example, "Snapshot before applying XYZ patch," can help you determine which snapshot to restore or delete.
4
(Optional) Select the Snapshot the virtual machine’s memory check box to capture the memory of the virtual machine.
5
(Optional) Select the Quiesce guest file system (Needs VMware Tools installed) check box to pause running processes on the guest operating system so that file system contents are in a known consistent state when you take the snapshot.
6
Click OK
"

and indeed, with memory snapshot, vm is paused too
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1013163


I don't for other hypervisor/solution

----- 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 11:32:11 
Objet: RE: [pve-devel] some news for snapshots 

> >>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 ? 

Yes, most users will expect that behavior. 

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

Sorry, but we simply need to restore full state. Users expect that (this is well known 
behavior on other products). 

> 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) 

Yes, I see. So maybe that is optional (but default is with RAW). 


- Dietmar 



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