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As novel storage model, cloud storage has gain attentions from both the academics and industrial communities. However along with variant advantages, it also brings new challenges in maintaining data integrity and highly available reliable data storage facility. The integrity of the data stored in the service provider is one of challenges to be addressed before the cloud storage is applied widely. Cost is also a major issue in cloud computing when users are switching to multi cloud. To address the entire scenario, the authors present a survey paper. This survey paper is based on the recent research related to single and multi cloud cost, security and availability based scenario. This paper aims to promote the use of multi cloud environment over single cloud to reduce the risk.
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