#!/bin/bash

# failback values
WARNING="45"
CRITICAL="50"

if [ ! -x /usr/bin/sar ]; then
   echo "UNKNOWN: sar binary not found"
   exit 3
fi 

IOWAIT=$(sudo sar 1 1 | awk '/all/{print $7}' | head -n 1 | cut -f1 -d".")

while getopts w:c: flag
do
    case "${flag}" in
        w) WARNING=${OPTARG};;
        c) CRITICAL=${OPTARG};;
    esac
done

if [ "$IOWAIT" -ge "$CRITICAL" ]
then
   echo "CRITICAL: IOWait is at $IOWAIT %";
   exit 2;
elif [ "$IOWAIT" -ge "$WARNING" ]
then
   echo "WARNING: IOWait is at $IOWAIT %";
   exit 1;
else
   echo "OK: IOWait is $IOWAIT %"
   exit 0;
fi