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Recently, Cloud Computing introduces some new concepts that entirely change the way applications are built and deployed. Usually, Cloud systems rely on virtualization techniques to allocate computing resources on demand. Thus, scalability is a critical issue to the success of enterprises involved in doing business on the cloud. In this paper, the authors will describe the novel virtual cluster architecture for dynamic scaling of cloud applications in a virtualized Cloud Computing environment. An auto-scaling algorithm for automated provisioning and balancing of virtual machine resources based on active application sessions will be introduced. Also, the energy cost is considered in the proposed algorithm. Their paper has demonstrated the proposed algorithm is capable of handling sudden load requirements, maintaining higher resource utilization and reducing energy cost.
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