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The availability of Web applications influenced by Virtual Machine (VM)-based physical locations during resource scaling is a crucial concern for customers and cloud providers. In this paper, we present a novel computing model to describe availability attribute of one application in hierarchical structured cloud. Meanwhile, we propose an availability-aware approach to explore how and where to allocate computing resource via vertical and horizontal scaling. Partial experimental results in simulation environment are also presented.
Wang et al. (Fri,) studied this question.