Besides, live backup uses the same IO thread as KVM, so it looks like using
one thread (with aio) perform less than using 2 thread.
But this can also be an advantage if you run more than one VM. Or you can backup
multiple VM at same time.
I agree, limiting IO from the VM during backup can have advantages.
On the flip side loosing 50% of the IO bandwidth in a database or mail
spool VM can be a significant problem.
If storage is really fast then IO in the VM is already limited by KVM,
limiting it even more has no advantage.
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