2009-01-26 4 Our Approach Load on machines varies over time Turn off subset of unnecessary machines, respectively restart machines according to load Problems Load is distributed over multiple machines Load reduction typically also distributed across multiple machines Need to consolidate load on a subset of machines in order to free up machines that can be turned off Goal: Minimum number of machines running Constraint: QoS must be ensured Service-Level Agreements (SLAs) must not be violated
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