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Cloud storage provides users with storage space and makes user friendly and timely acquire data, which is foundation of all kinds of cloud applications. However, there is lack of deep studies and research on how to optimize cloud storage aiming at improvement of data access performance over cloud. In this environment, consumers are billed as per they used. Generally it is called as "Pay-as-you-go". In other words, If one have used for an hour, the people are about to pay for the used hour. It is based upon the services. Each service has its own cost.
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