<p>When running any kind of server under load there are several resources that one would like to monitor to make sure that the server is healthy.  This is specifically true when testing the system under load.</p>

<p>Some examples for this would be CPU utilization, memory usage, and perhaps disk space.
What other resource should I be monitoring, and what tools are available to do so?</p>

I typically watch
```
top
```
and
```
tail -f /var/log/auth.log
```
.