CosMig: Modeling the Impact of Reconfiguration in a Cloud

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Executive Summary

Clouds allow enterprises to increase or decrease their resource allocation on demand in response to changes in workload intensity. Virtualization is one of the building blocks for cloud computing and provides the mechanisms to implement the dynamic allocation of resources. These dynamic reconfiguration actions lead to performance impact during the reconfiguration duration. In this paper, the authors model the cost of reconfiguring a cloud-based IT infrastructure in response to workload variations. They show that maintaining a cloud requires frequent reconfigurations necessitating both VM resizing and VM live migration, with live migration dominating reconfiguration costs.

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