[fedora-virt] VM snapshot with qemu-img
rt
r_torresa at yahoo.it
Tue Sep 22 18:34:34 UTC 2009
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 at accelance.fr> ha scritto:
> Da: Benjamin Cleyet-Marrel <bcm at accelance.fr>
> Oggetto: Re: [fedora-virt] VM snapshot with qemu-img
> A: "Richard W.M. Jones" <rjones at redhat.com>
> Cc: fedora-virt at 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 at redhat.com>
>
> À: rt <r_torresa at yahoo.it>
>
> Cc: fedora-virt at 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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