Data Centers

DAHM: A Green and Dynamic Web Application Hosting Manager Across Geographically Distributed Data Centers

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Executive Summary

Dynamic Application Hosting Management (DAHM) is proposed for geographically distributed data centers, which decides on the number of active servers and on the workload share of each data center. DAHM achieves cost-efficient application hosting by taking into account: the spatio-temporal variation of energy cost, the data center computing and cooling energy efficiency, the live migration cost, and any SLA violations due to migration overhead or network delay. DAHM is modeled as fixed-charge min-cost flow and mixed integer programming for stateless and stateful applications, respectively, and it is shown NP-hard.

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