You want to deploy Xsan on a few Xserves, and you don't know the first thing about RAID options or LUNS. The obvious question is, 'Why are you deploying Xsan if you know nothing about it?' The answer is clear, 'Because it is just so darned cool!'
Just look at that box, and the Xsan logo? Super cool.
Luckily for you AFP548 has posted an article designed to transform you from an Xsanless loser into someone who can at least talk about Xsan at a cocktail party (and what a party that would be).