[sheepdog] [Qemu-devel] [PATCH 0/3] sheepdog: support online snapshot from qemu-img

Eric Blake eblake at redhat.com
Thu Apr 25 15:44:29 CEST 2013

On 04/25/2013 04:37 AM, MORITA Kazutaka wrote:
> Currently, we can take sheepdog snapshots of running VMs only from the
> qemu monitor.  This series allows taking online snapshots from
> qemu-img.

Is that even safe?  We specifically recommend that users NOT use
qemu-img on any image that is in-use by a qemu process, and instead only
use qemu monitor commands; since qemu-img may see inconsistent state,
and worse, any writes that qemu-img do may cause qemu to see
inconsistent state and cause corruption to the running guest.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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