One of the main motivations for the shift to the Cloud (and the more recent shift of telco operators into NFV) is cost reduction due to high utilization of infrastructure resources. However, achieving high utilization in practical scenarios is complex since the term "resources" covers different orthogonal aspects, such as server CPU, storage (or disk) usage and network capacity, and the workload characterization varies over time and over different users.
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Raz et al. (2017) studied this question.
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