Abstract
This paper evaluates five policies for cluster-wide power management in server farms. The policies employ various combinations of dynamic voltage scaling and node vary-on/vary-off (VOVO) to reduce the aggregate power consumption of a server cluster during periods of reduced workload. We evaluate the policies using a validated simulator that calculates the energy usage and response times of a Web server cluster serving traces culled from real-life Web server workloads.
Our results show that a relatively simple policy of independent dynamic voltage scaling on each server node can achieve savings ranging up to 29% and is competitive with more complex schemes for some workloads. A policy that brings nodes online and takes them offline depending on the workload intensity also produces significant savings up to 42%. The largest savings are obtained by using a coordinated voltage scaling policy in conjunction with VOVO. This policy provides up to 18% more savings than just using VOVO in isolation. All five policies maintain server response times within acceptable norms.
This research has been supported in part by The Defense Advanced Research Projects Agency under contract F33615-00-C-1736.
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Elnozahy, E.N.(., Kistler, M., Rajamony, R. (2003). Energy-Efficient Server Clusters. In: Falsafi, B., Vijaykumar, T.N. (eds) Power-Aware Computer Systems. PACS 2002. Lecture Notes in Computer Science, vol 2325. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-36612-1_12
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DOI: https://doi.org/10.1007/3-540-36612-1_12
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