This paper described Berkeley's understanding of Cloud Computing. It defines what Cloud computing is (SaaS + software and hardware infrastructure from Cloud providers), what the current spectrum of Cloud computing(AWS, Apps Engine, Azure) is, why it is more likely to succeed this time (economy of scale for Cloud providers, elasticity + minimal upfront cost for Cloud users, more applications like mobile interactive apps and compute-intensive apps for SaaS users), and current obstacles and opportunities.
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