The Promise Vtrak is the only officially supported platform that can be used to provide LUNs to an Xsan. Having said that, there are a number of other storage vendors that are supplying LUNs at this point. And while I don’t really want to speak to that it is worth noting that it brings me joy to watch the ever-expanding number of vendors testing their products for and then marketing to the Xsan community. One that I came across recently is Dot Hill, who did a video showcasing their speedy 2U product at NAB.