cyla

#!/bin/bash
#%# family=auto
#%# capabilities=autoconf suggest

if [ "$1" = "autoconf" ]; then
    echo yes
    exit 0
fi

if [ "$1" = "suggest" ]; then
    awk '/ [hs]d[a-z][0-9]* / { print $3 }' /proc/diskstats
    exit 0
fi

device=$(basename $0 | sed 's/^diskutil_//g')
ncpu=$(egrep -c '^cpu[0-9]+ ' /proc/stat)

if [ "$1" = "config" ]; then
    echo 'graph_category disk'
    echo "graph_title Disk utilization for /dev/${device}"
    echo 'graph_args -l 0 -u 100'
    echo 'graph_vlabel %'
    echo 'util.label utilization'
    echo 'util.info utilization %'
    echo 'util.type GAUGE'
    echo 'util.draw AREA'
    exit 0
fi

statefiledir=/var/lib/munin/plugin-state/
statefile="${statefiledir}diskutil-${device}.state"

newticks=$(awk '/^cpu / { print $2+$3+$4+$5+$6+$7+$8+$9+$10 }' /proc/stat)
newioticks=$(awk "/ $device / { print \$13 }" /proc/diskstats)
if [ -s $statefile ] ; then
    read oldticks oldioticks <$statefile
else
    oldticks=$newticks
    oldioticks=$newioticks
fi
echo "${newticks} ${newioticks}" > $statefile

deltaticks=$(($newticks-$oldticks))
deltaioticks=$(($newioticks-$oldioticks))

printf "util.value %d.%d\n" $(($deltaioticks*$ncpu*10/$deltaticks)) $(($deltaioticks*$ncpu*10*10000/$deltaticks-$deltaioticks*$ncpu*10/$deltaticks*10000))