Storage is rapidly evolving from a cost center to a strategic IT infrastructure. It needs to support key business goals and increased customer satisfaction by providing any time, anywhere access to crucial business data with 100% availability. New technologies enable these storage-centric infrastructures to go beyond online hard disk systems and offline storage archives to include special storage servers, new storage networks, and the management software to make it all appear as a seamless whole to enterprise applications. Basically, it is viewed as a giant disk in the sky with infinite capacity.