nagios plugin for monitoring mdraid mismatch count

check_mdraid_mismatch

#!/bin/bash
# stolen from https://www.thomas-krenn.com/en/wiki/Mdadm_checkarray
# template from http://www.juliux.de/nagios-plugin-vorlage-bash

# modified to work with more than one array by ursetto

set -e

WARN_LIMIT=$1
CRIT_LIMIT=$2
if [ -z $WARN_LIMIT ] || [ -z $CRIT_LIMIT ]; then
    echo "Usage: check_linux_raid_mismatch WARNLIMIT CRITLIMIT"
    exit 3;
fi

DATA=0
PERF_DATA=""

for file in /sys/block/md*/md/mismatch_cnt
do
  if [ ! -f $file ]; then
      echo "UNKNOWN - $file not found | "
      exit 3;
  fi
  DATA=$((DATA + $(cat $file)))
  MD_NAME=$(echo $file | awk -F/ '{ print $4 }')
  PERF_DATA+="$MD_NAME=$(cat $file) "
done

if [ $DATA -lt $WARN_LIMIT ]; then
    echo "OK - all software raid mismatch_cnts are smaller than $WARN_LIMIT | $PERF_DATA"
    exit 0;
fi
if [ $DATA -ge $WARN_LIMIT ] && [ $DATA -lt $CRIT_LIMIT ]; then
    echo "WARNING - software raid mismatch_cnts are greater or equal than $WARN_LIMIT | $PERF_DATA"
    exit 1;
fi
if [ $DATA -ge $CRIT_LIMIT ]; then
    echo "CRITICAL - software raid mismatch_cnts are greater or equal than $CRIT_LIMIT | $PERF_DATA"
    exit 2;
fi