How to monitor hard drive temperature with MRTG and FreeBSD
I really love to monitor my servers, so why shouldn’t I also monitor the temperatures of my hard drives? In my mind a cooler hard drive lives longer than a hot one. However, the google paper on failure trends of hard drives says that the hard drive temperatures doesn’t have an impact on a hard drives life length. But I want things to run cool in my server so here is how I monitor the hard drives with mrtg and FreeBSD.
To be able to get the hard drives temperatures we have to install SmartMonTools.
The smartmontools package contains two utility programs (smartctl and smartd) to control and monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (SMART) built into most modern ATA and SCSI harddisks. In many cases, these utilities will provide advanced warning of disk degradation and failure.
Install SmartMonTools
# cd /usr/ports/sysutils/smartmontools
# make install clean
Check the temperature of the drives that you want to monitor
# smartctl -a /dev/ad4 | grep Temperature_Celsius
194 Temperature_Celsius 0×0022 113 103 000 Old_age Always – 34
# smartctl -a /dev/ad6 | grep Temperature_Celsius
194 Temperature_Celsius 0×0022 148 091 000 Old_age Always – 30
Create a script called disktemp.sh that outputs the temperatures in a Mrtg friendly way.
#!/bin/sh
/usr/local/sbin/smartctl -a /dev/ad6 | grep Temperature | awk '{print $10}' | tail -n 1
/usr/local/sbin/smartctl -a /dev/ad4 | grep Temperature | awk '{print $10}' | tail -n 1
echo "A long time"
echo ""
Then create a mrtg cfg file called disktemp.cfg:
### Global Config Options WorkDir: /home/www/mrtg Options[_]: growright, bits EnableIPv6: no Language: swedish # Sysload Target[disktemp]: `/usr/local/etc/mrtg/disktemp.sh` MaxBytes[disktemp]: 100 Options[disktemp]: integer,gauge,nopercent YLegend[disktemp]: Temp (C) ShortLegend[disktemp]: (C) Legend1[disktemp]: /dev/ad4 Legend2[disktemp]: /dev/ad6 LegendI[disktemp]: /dev/ad4 LegendO[disktemp]: /dev/ad6 Title[disktemp]: Hard drive Temperature PageTop[disktemp]:Hard drive temperature
Run mrtg (a couple of times)
/usr/local/bin/mrtg /usr/local/etc/mrtg/disktemp.cfg
Check If everything seems to be working. If OK then add this to crontab…
The result should be looking like this (in your language):
