The nmon2rrd tool converts nmon csv files to web pages. The benefit is that the process can be automated with shell scripts (as compared to the "nmon_analyzer" tool which is a more manual process)

I've created two AIX Tips that include a shell scripts to illustrate how the process might be automated

Part 1: http://www.aixtips.com/AIXtip/nmon2rrdv1.htm
Part 2: http://www.aixtips.com/AIXtip/nmon2rrdv2.htm

Part1 shows how to automate the collection, conversion, organization and display of daily nmon data into web pages using the nmon2rrd tool.

Part 2 extends the this to include long term trend charts.