The rapid growth of E-Business and the frequent changes in sites contents pose the need for rapid and dynamic scaling of resources. Cloud computing infrastructure, based on virtualization technologies, enables agile and dynamic scalability of resources. However, current implementation of the scalability in the cloud uses the Virtual Machine (coarse-grained) as a scaling unit which often leads to over-provisioning of resources. Hence, we propose Elastic VM (fine-grained) scaling architecture. It implements the scalability into the VM resources level to optimize resources' allocation. We support our approach by analytical analysis and describe in details how Elastic VM architecture improves the performance and optimize the dynamic allocation of resources.
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