My guess would be that the petabyte of storage is the selling point and the fact that the ratio of CPU's to storage is pretty high means it can probably act as a high performance low cost SAN or something like that.  With 512 CPUS that's one per 2 TB drive per processor.  Seems similar to a Capricorn Tech's approach, <a href="http://www.capricorn-tech.com/" rel="nofollow">http://www.capricorn-tech.com/</a>