Hi Ed (and all)
There's absolutely no problem installing IDS/9000 agents and the admin GUI on the same system for evaluation purposes. We do it all the time while testing in the lab.
True, the java interpreter will run a CPU at about 100% load, but you can quit the GUI and leave the agent running in the background. Alerts will be logged into the /var/opt/ids/alert.log file.
In a production environment we recommend only running an agent on a server that you are monitoring. The GUI can run on any other HPUX machine with java and a network connection.
How does IDS/9000 impact your system? As a previous poster mentioned it is highly dependent on your system profile. I have attached a short text document that outlines some "Best Practices" that I wrote up about configuring IDS. It will grow into a full white paper on configuration and deployment.
Hope this helps,
Mark
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Mark Crosbie IDS/9000 Product Architect
http://www.hp.com/security/products/ids