Re: [libvirt-users] how to detect if qemu supports live disk snapshot
On 01/14/2014 08:13 PM, Gao Yongwei wrote:
>
>
>>
>> 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.
>
Hi, does this command can help with you?
virsh qemu-monitor-command vmname --hmp 'help' | grep snapshot_blkdev
This would work for current versions of qemu, but may not work in the
future (as HMP does not guarantee stable output) - parsing QMP output
would be more reliable. Furthermore, the 'qemu-monitor-command' is
intentionally unsupported, although this particular use is safe because
it doesn't change guest state behind libvirt's back.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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