[libvirt-users] Disk-only internal snapshot

Davide Guerri davide.guerri at gmail.com
Wed Oct 24 21:01:10 UTC 2012

Thank you Eric for the quick reply!
Do you know if there's a way to remove (not revert) an external snapshot on
a live domain?

I'm trying to backup (live) machines with the shortest downtime possible.

The script I'm using makes a (full) snapshot of a VM, restore its state,
copies (with qemu-img convert) the snapshot out of the qcow file and
removes the snapshot.

Thanks again,

2012/10/24 Eric Blake <eblake at redhat.com>

> On 10/24/2012 02:27 PM, Davide Guerri wrote:
> > Hi all,
> > it's possible to do an internal snapshot with the --disk-only option (for
> > qcow2 images)?
> Not with the current qemu implementation.  The qemu folks left room in
> the 'blockdev-snapshot-async' monitor command to eventually allow for an
> internal snapshot, but haven't wired it up yet.  But if they ever do
> wire it up, then libvirt is ready to support it.
> >
> > The following command
> >
> > virsh snapshot-create-as my-dom my-snap my-description
> >
> > creates an internal snapshot but the following
> Also, be aware that Peter just posted patches to allow for creating an
> external snapshot without using --disk-only, with much better response
> time than internal snapshots take:
> https://www.redhat.com/archives/libvir-list/2012-October/msg01290.html
> >
> > virsh snapshot-create-as my-dom my-snap my-description --disk-only
> >
> > creates an external snapshot.
> >
> --
> Eric Blake   eblake at redhat.com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
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