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A datacenter can generate 170 million tons of CO2 per year.Excessive heat discharge leads to the reduced lifetime of IT infrastructure.Each VM runs in an independent OS and applicationsVMs are characterised by a number of parameters (CPU, memory, network bandwidth, MIPS, etc.) –useful for task allocation. Analytics about VM’s state are also known.CloudSim is a data center simulator described as a modelling, simulation and experimentation tool-kit for clouds, data centers and VMs.CloudSim considers mainly the CPU usage for calculating the power consumption.VMs migration is an interesting technique to optimise energy consumption but goes in detriment of QoS / SLA.