[libvirt-users] how to detect if qemu supports live disk snapshot
Eric Blake
eblake at redhat.com
Tue Jan 14 19:43:29 UTC 2014
On 01/13/2014 04:57 AM, Francesco Romani wrote:
>
> After reading from the docs, it seems that libvirt doesn't reports yet this information about
> the hypervisor in the capabilities XML: http://libvirt.org/formatcaps.html
>
> a quick test against libvirt 1.1.3 (qemu 1.6.1) on Fedora 20 seems to confirm (see XML dump below[1]).
Correct. It might indeed be a useful addition to the capability XML.
>
> So, if I'm not mistaken, looks like the only way to test for the support in QEMU is to actually
> request a snapshot and see what happens.
> Is this right?
Unfortunately true for the moment.
>
> If this is correct, I would like to craft and propose a patch to libvirt to export this information,
> maybe into a form of some kind of warning list/blacklist: disk snapshotting it is supposed to be
> available, but this particular QEMU doesn't support it.
Capability XML would be the proper way to expose this.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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