> >  (if yes, maybe it can be fast with a slow random io backup storage
> > but with high sequential throughput)
> 
> Anyways, you can solve that problem easily. All you need is some fast
> temporary storage, and you buffer writes by writing to that storage first.
> Should be really easy to implement.

On the other side, we wanted to avoid such additional overhead, so that
only makes sense for very slow storage.

Maybe the best would be to use internal snapshots on storage types which 
supports
that. But internal qcow2 and lvm  snapshots does not work well. But maybe rbd, 
lvm-thin or
sheepdog work better.
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