Il 26-02-2018 22:31 Darrick J. Wong ha scritto:

I believe qemu-ga takes care of guest fs freeze inside the guest,
and you can invoke it from the host via 'virsh domfsfreeze' or the
--quiesce argument to snapshot-create... but you ought to confirm that
for yourself.

Sure, and I can confirm it works properly in Linux VMs (Windows VMs are 
another matter, if things have not changed).
However it also poses a security risk: a malicious agent can will block 
your *entire* backup process (even for other virtual machines).

So, in some environments, an agentless backup solution is preferred.
Thanks.

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Danti Gionatan
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