I was wondering what you guys have on your enterprise servers running Linux that also monitors CPU temp and air temps? We currently have 10 Linux servers (RHEL 5 & CentOS) and don't have a way to see how hot their running.

Any suggestions?

It is a shame my DELL enterprise server (a Dell PowerEdge 2950) it is not compatible with lm-sensors what would make the things easier.
I can't use hddtemp either. When the SAS disks are in RAID, running hddtemp results in a kernel panic !

But theses machines have a BMC (Baseboard Management Controller, or something like that) and it is accessible by IPMI, both OpenIPMI and freeipmi.
I am using Nagios to get nrpe execute a shell script that format ipmi output in Nagios performance data format.
Using IPMI I can get values for fans, Voltages, temperatures, intrusion chassis switches, get status of/and control the power supply (on, off, cycle) and more.

It is not fast, it is kind messy, it is fragile, but at least I known how hot they are and trigger an emergency power off and have historical data which is very important.

I use Gkrellm on OpenSuse 10.3.

Have used it for a few years on many linux distros. Works Like a charm. Highly configurable and as a lot of user created plugins.

I monitor my Opteron 175 CPU usage, temperatures of both cores, Motherboard temps, HDD, Fan RPM, etc...Disk activity.

Here is the link. Enjoy:
http://members.dslextreme.com/users/...m/gkrellm.html

lm-sensors. Monitors all kind of hardware parameters.

gkrellm uses lm-sensors

Do you guys have a stand alone solution at all? Something that runs independent of the server and will send email / sms?

not IN the server, but in the rack.
Our rack has a SNMP monitoring box that has temperature sensor, humidity and smoke detector.
But it is not much useful. The readings are pretty stead. However we never had a disaster to change the readings that much.

If you want a easy to use, stable and supported Nagios solution there is one from op5 where you can monitor temp, hardware, services and other stuff. You can try it or download a vmware image on op5s homepage.

//Klas