Ever since Eric Schmidt, the Chief Executive of Google Inc. mentioned the magical term – “Cloud Computing” – in the year 2006, a gale has been crowding over the Silicon Valley. Companies across the IT industry are competing against each other to associate themselves with the cloud computing technology in one way or the other. Amazon.com Inc., for example, (hurriedly) started selling Elastic Compute Cloud service the same year, for programmers to rent the company’s giant computers.