#!/bin/bash
#filename=iopxen by Dennis Mischenko
#usage iopxen domain priority

if [ $# -gt 0 ]
then
 dom_ID=`xm domid $1`
 for I in `seq 2049 2050` ;
 do
    A=`xenstore-read /local/domain/0/backend/vbd/$dom_ID/$I/physical-device`
    x_val=`echo $A | awk -F: {' print $2 '}`
    x_len=`echo $x_val | wc -m`
    #Because in process list fd devices use 2 digest for number...
    if [ $x_len -lt 1 ]
    then
        ionice -c2 -n$2 -p`pgrep $A`
    #    pgrep $A
    else
        B="fd:0$x_val"
        ionice -c2 -n$2 -p`pgrep $B`
    #    pgrep $B
    fi
 done
else
    echo "Usage: iopxen domainname ioval"
fi

# iopxen domain.vm 6