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Unleash Stranded Power in Data Centers with RackPacker   
摘  要:   Data center infrastructures are highly underutilized on average. Typically, a data center manager computes the number of servers his facility can host by dividing the total power capacity of each rack by an assigned "peak power rating" for each server. However, this scheme suffers from the weakness of all static provisioning schemes - it does not account for the variability of load on the servers. We pro- pose an algorithm that studies the power consumption be- havior of the servers over time and suggests optimal ways to combine them in racks to maximize rack power utiliza- tion. Our algorithm - RackPacker - smooths aggregate rack power utilization by grouping together servers that are un- likely to peak together. Our evaluation of RackPacker on data from an MSN Messenger deployment shows substan- tially superior results than static packing.

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