UPDATED: Great new AIX Performance and Virtualisation resources
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Updated: Performance Monitoring Tips and Techniques
Nigel Griffith's wiki on Performance Monitoring Tips and Techniques has a wealth of information on performance of AIX systems. The Wiki also includes a link to the downloads for the perfpmr tool, which allows you to get a snapshot of system performance before the problems occur.
First, Jaqui Lynch has done a great service with the first in a two-part series on AIX tuning in the IBM Systems Magazine. She really digs down into why we set certain parameters. Covers the benefits of smart paging space layout (all paging spaces the same size, on quiet LUNs and more), LRUD, file systems, and tweaking LVM performance with the lvmo command.
You can find the whole article here.
There's also a very simple table (Figure 1 in the article and reproduced below), which covers some parameters showing the default settings of various paramters and Jaqui's recommendations. She explains the reasoning behind these recommendations.
It's a great read, as all of Jaqui's articles are.
AIX Tuning with Earl Jew - Part II
Next in the performance space, there was Earl Jew's AIX Tuning Part II. I referred to Part I in the post Is your AIX system clocking up overtime? Part II delves more into many performance issues, including the output of the vmstat command.
Another first-in-a-series article covers Optimizing AIX 7 performance: Disk I/O overview and long-term monitoring tools. Don't be thrown off if you're not thinking of migrating to AIX 7 for a long time. Most of the ideas are applicable for AIX 5.3 and 6.1.
Architect's guide to IBM Virtualisation
Finally, although it's not directly addressing performance, there is a great new whitepaper on Understanding the ABCs of PowerVM. It's an architect's guide to IBM PowerVM technologies. It covers: