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We have a 3Ware 9550SX-8LP installed in a Linuxserver running Ubuntu Server. What I am going to describe is, how we monitor the Harddisk Temperature via Nagios and graphing it via NagiosGrapher. This HowTo can easily be modified for other 3Ware Controllers.

Temperaturegraph from a 3Ware 9550SX-8LP with NagiosGrapher

Installation and configuration of needed packages

• #aptitude install smartmontools snmpd

• Copy the a wrapper script for smartmontools to /usr/local/bin/get_smart_value.sh, it will be used by SNMP later

  #!/bin/bash
  # Extract the Temperature Value from the SMART values gained by smartclt
  # the value 194 contains the HDD Temperature
  smartctl -a -d 3ware,${1} ${2} | grep ^194 | awk '{print $10}'

  … and do a chmod +x /usr/local/bin/get_smart_value.sh

• Configure SNMPd to to run extend-Commands (/etc/snmp/snmpd.conf) and add at the end of the file:

  ...
  extend 3Ware_1_Port0 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 0 /dev/twa0'
  extend 3Ware_1_Port1 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 1 /dev/twa0'
  extend 3Ware_1_Port2 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 2 /dev/twa0'
  extend 3Ware_1_Port3 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 3 /dev/twa0'
  extend 3Ware_1_Port4 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 4 /dev/twa0'
  extend 3Ware_1_Port5 '/usr/bin/sudo /usr/local/bin/get_smart_value.sh 5 /dev/twa0'
  #in our system just 6 HDDs are connected so we will return 0 for the non used
  extend 3Ware_1_Port6 '/bin/echo 0'
  extend 3Ware_1_Port7 '/bin/echo 0'

  … and restart SNMPd with /etc/init.d/snmpd restart

• # visudo

  and add the following line

  snmp    ALL = NOPASSWD: /usr/local/bin/get_smart_value.sh

  … to allow snmp run the script as SuperUser, which is needed to get the S.M.A.R.T. values via smartctl

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This article will explain some parts of monitoring a Cisco Catalyst 2970 switch via SNMP and Nagios. Together with NagiosGrapher it gets an powerful combination to have a longtime overview about that device and you can create nice graphics like that:

Prepare the switch for SNMP requests from a SNMP polling host (here 192.168.200.200) :

access-list 60 permit 192.168.200.200
snmp-server community yoursnmpcommunitystring RO 60
snmp-server location "near the backbone"
snmp-server contact "admin@myswitch.de"

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