During a customer POC with FastTrack we recognized that the correct LUN Mapping is essentially to use the maximum throughput of the storage. So together with Alexei Khalyako from SQL CAT we wrote a white paper about this topic: http://sqlcat.com/sqlcat/b/msdnmirror/archive/2012/05/03/fast-track-improving-performance-through-correct-lun-mapping-and-storage-enclosure-configuration.aspx