QUESTION: What makes IT managers of business units give up the immediate and detailed control of their particular storage environments (islands) in order to work towards a consolidated utility like a storage service?
ANSWER: That's really easy -- better performance and lower cost. The key to it is measurement. Most business unit managers take over IT because they believe "corporate IT" can respond quickly enough to their particular business needs or do so a a multiple of the cost it will require them to run it themselves. Most often, after a little while, they realize running IT is about more than PC and printers and a little more taxing than a part-time job. The key to them giving back control to a central body or service is to have compelling arguments around the things that made them internalize the service in the first place - cost and quality of service.