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Data centers are designed to provision sufficient virtualized resources at all times to meet the demands of users. Now-a-days the users who have "Elastic demand" take advantage of the "Pay-as-you-go" model and only request needed demands which vary over time. Considering the dynamics of the demand on virtualized resources is indispensable to reduce the operational costs in the context of "Pay-as-you-go" model. In this paper, the authors formulate the optimization problem of minimizing the operational costs with dynamic demand. Furthermore, a new simple index to estimate the optimum is proposed.
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