13-04-08

nagios and swraid

I like nagios and software raid on my Linux boxes to make sure I don't lose any data, but I was unhappy with the script I used to monitor it. Attached is a new one that is shorter and works better, as it leaves all the work to the mdadm tool instead of trying to parse /proc/mdstat.

#!/bin/sh

# (c) 2008 Jasper Spaans <j@jasper.es>

worst=0

msg=""

for dev in /dev/md?* ; do \

  mdadm --misc -t $dev

  status=$?

  if [ $status == 0 ]; then

    msg="${msg} ${dev}: ok"

  elif [ $status == 1 ] ; then

    if [ worst != 2 ] ; then

      worst=1

    fi

    msg="${msg} ${dev}: degraded"

  elif [ $status == 2 ] ; then

    worst=2

    msg="${msg} ${dev}: unusable"

  fi

done



echo $msg

exit $worst

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Jasper Spaans

at 22:00 | Comments (2) | Trackbacks (0)

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It's a nice script that doesn't require any prerequisites, however I don't have 32 md devices in actual use.

It might be better to parse the /etc/mdadm.conf file. So your first line might read:

for dev in `cat /etc/mdadm.conf | grep md?* | sort | awk '{print $2}'` ; do \

Which avoids checking my non-existent md3-md32 devices.

#1 David Gore on 2008-04-23 01:29 (Reply)

A correction and some details:

The line I would replace would be line FIVE (the initialization of the "for" loop) and not line ONE.

The reason I find this necessary is because, in SL4.3 (fedora variant), there are 32 "md" devices listed in /dev even though they may not be all used.

Thus the correction just looks at those devices defined in /etc/mdadm.conf, which is where one would want to look.

#2 David Gore on 2008-04-23 01:47 (Reply)

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