An updated version IBM's IBM I on Power – Performance FAQ was published today, called a "Spring refresh" by Steve Will the IBM i chief architect.
The What's new in the latest version?, section 1.3 on page 11, lists eight new questions added to the document.
If you are just a programmer type, not dealing with the finer points of tuning a Power server, there are sections to do with optimizing Cobol and RPG too:
- Section 8.14 p57: How do I tune RPG/COBOL application performance and native I/O file access?
- Section 9 p62-68: Database performance
- Section 10 p69-70: RPG/Cobol native I/O
Good stuff to read, learn, and apply to your work.
The document is a PDF file and can be found on IBM's web site here.