I'm interested, but don't have enough understanding of very large systems to follow this article (without spending a lot of time on it). I'd love to learn: Coul

I'm interested, but don't have enough understanding of very large systems to follow this article (without spending a lot of time on it). I'd love to learn: Could someone provide a little background on the current state of the art in very large system storage? Also, what about the planned future systems would be incompatible with POSIX?