Just as public cloud computing is beginning to catch on, the enterprise data center world has been shaken up by the biggest IT product vendors. Rather than sit back and watch their wares commoditized, companies like Cisco, EMC, HP, and now HDS are stepping up to the plate with integrated “stacks” that include server, storage, networking, and management software. The next-layer players, VMware and Microsoft in particular, are joining hands, too, eager to support these stacks. To paraphrase the wise Jedi master, Yoda, “cloudy, the future is.” So, the stack wars have begun!