about of ionice in vzdump

AFAIR value 8 maps to the IDLE class, whereas values 0-7 maps to normal 'Best Effort' ionice priorities,
 
But I think ionice will not help you on the NFS share (only works on block devices).

Hi Dietmar, I am pleased to greet you again and please consider that my VMs run on local mode

Best regards
Cesar
 

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