#!/bin/bash
# Script for monitoring software RAID devices using md5 checksums of the
# /proc/mdstat file. Set up a cron job to run this script as often as you'd
# like to check the RAID status. Requires sendmail (or equivalent) on the
# local machine. Contributed by Stian Barmen.

# Set a value for tmp and email header file
tmp=/root/scripts/raidcheck
header=$tmp/header

# First time tool is run this will fail, but after next time
# this will compare the md5 of /proc/mdstat to the saved 
# value of the md5sum file.
a=`md5sum -c $tmp/md5sum`
if [ "$a" = "/proc/mdstat: OK" ]

then

  echo "RAID Check: All status OK"

else

  # Send mail that status changed, attaching a standard email header
  # from the file header (see the attached example) plus the status
  # from /proc/mdstat.
	a=`cat /proc/mdstat`
  	`echo -e "Subject: RAID Check warning!\n\n"\
		 "Check the status of the RAID below!\n\n"$a\
 	| sendmail root`
  # Add new md5 key to checkfile (this is now status OK)
  `md5sum /proc/mdstat > /root/scripts/raidcheck/md5sum`

fi