Any data you can collect with a shell script, you can graph with MRTG. The first step is to write a shell script that outputs the data in the right form - there are several listed here, one might be close to what you want:
http://people.ee.ethz.ch/~oetiker/we...rtg/links.html
In the MRTG config, look for "External Monitoring Scripts" on
http://people.ee.ethz.ch/~oetiker/we...reference.html
If a shell script doesn't do what you want, look at a Linux SNMP agent - one more thing to set up though, and SNMP isn't too secure on its own.
