check_io

#!/bin/bash

. $(dirname $0)/lib.sh

# Simple function to calculate and round with bc
function calcr() {
	bc -l <<< "
		result = $1
		if (length(result) > 23) {
			scale = 0
		} else {
			scale = 23 - length(result)
		}
		result / 1"
}

if [ -z "$1" -o "$2" ]; then
	echo "Usage: $0 <device>"
	exit $STATE_UNKNOWN
fi

DEV=$1
STATE=/var/lib/nagioschecks/check_io_$DEV

if [ ! -f $STATE ]; then
	cat /sys/block/$DEV/stat > $STATE || exit 1
	echo "OK - State initialized on first call, now call again"
	exit $STATE_OK
fi

LAST=($(mtime_cat $STATE))
cat /sys/block/$DEV/stat > $STATE
CURRENT=($(mtime_cat $STATE))

TIME=$((${CURRENT[0]} - ${LAST[0]}))

READ_BYTES=$(((${CURRENT[3]} - ${LAST[3]}) * 512 / TIME))
WRTN_BYTES=$(((${CURRENT[7]} - ${LAST[7]}) * 512 / TIME))

READ_IOPS=$(calcr "(${CURRENT[1]} - ${LAST[1]}) / $TIME")
WRTN_IOPS=$(calcr "(${CURRENT[5]} - ${LAST[5]}) / $TIME")
TOTAL_IOPS=$(calcr "(${CURRENT[1]} - ${LAST[1]} + \
	${CURRENT[5]} - ${LAST[5]}) / $TIME")

echo "$TOTAL_IOPS IOPS - \
read $(bytes_to_human $READ_BYTES)/s, $READ_IOPS IOPS - \
written $(bytes_to_human $WRTN_BYTES)/s, $WRTN_IOPS IOPS - \
averaged over $((TIME / 60)):$(printf %02d $((TIME % 60))) minutes|\
read=${READ_BYTES}B wrtn=${WRTN_BYTES}B readop=$READ_IOPS wrtnop=$WRTN_IOPS \
iops=$TOTAL_IOPS"

exit $STATE_OK