Re: [fedora-virt] VM snapshot with qemu-img

[rt <r_torresa yahoo it>]

I think it too.
>From the qcow2 format at http://www.gnome.org/~markmc/qcow-image-format.html:
"vm_state_size gives the size of the virtual machine state which was saved as part of this snapshot"

Anyway what I'm needing now is a working snapshot, does not matter if I've to shutdown the vm before taking it.

I'm very annoyed of vmserver that needs recompilation and other tricks to work after a kernel upgrade.

I tried also VirtualBox but kvm seems to me faster...

I will try multiple snapshot on powered off vm to see if it works...

Thanks again.
Regards,
Roberto 

--- Mar 22/9/09, Benjamin Cleyet-Marrel <bcm accelance fr> ha scritto:

> Da: Benjamin Cleyet-Marrel <bcm accelance fr>
> Oggetto: Re: [fedora-virt] VM snapshot with qemu-img
> A: "Richard W.M. Jones" <rjones redhat com>
> Cc: fedora-virt redhat com
> Data: Martedì 22 settembre 2009, 15:06
> 
> 
> 
>   
>   
> 
>  
> Hi Richard,
> 
> 
> 
> I think it is possible using qemu to do a live snapshot
> provided that you use qcow2 image format.
> 
> If you send a savevm to the qemu monitor it will save the
> RAM cpu position to the qcow2 image and perform a snapshot
> of all attached device.
> 
> you can then get the list of snapshot using info snapshots
> 
> and restore it by doing loadvm.
> 
> 
> 
> Cheers
> 
> Ben
> 
> 
> 
> 
> 
> -------- Message initial --------
> 
> De: Richard W.M. Jones <rjones redhat com>
> 
> À: rt <r_torresa yahoo it>
> 
> Cc: fedora-virt redhat com
> 
> Sujet: Re: [fedora-virt] VM snapshot with qemu-img
> 
> Date: Tue, 22 Sep 2009 13:48:35 +0100
> 
> 
> 
> 
> On Mon, Sep 21, 2009 at 10:08:58AM -0700, rt wrote:
> > I tried to take snapshot of vm using "qemu-img
> snapshot" command but
> > reverting to a snapshot corrupt the vm disk...
> 
> This is only ever going to work if the VM is shut down when
> you take the snapshot.
> 
> Sorry, but we just don't have the ability to do live
> snapshots
> of running VMs.  It requires a lot of work throughout the
> stack
> (qemu / libvirt / user tools).
> 
> Rich.
> 
> 
> 
>  
> 
> 
> -----Segue allegato-----
> 
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