This is a the quick easy way to get lmsensors installed on your server (without having to compile kernel modules, etc):

1. Run: yum install sensor
2. Run: sensors-detect (to configure sensor automatically)
3. Run: restart senors
4. sensors

With lm_sensors you can view system temperature, fan speeds, voltages, etc.  Its a great way to monitor some of the finer aspects of your server.