`ionice`: `<integer> (0 - 8)` ('default =' `7`)::
-Set CFQ ionice priority.
+Set IO priority when using the BFQ scheduler. For snapshot and suspend mode backups of VMs, this only affects the compressor. A value of 8 means the idle priority is used, otherwise the best-effort priority is used with the specified value.
`lockwait`: `<integer> (0 - N)` ('default =' `180`)::