Cloud computing is an emerging IT technology that is being used increasingly in industry, government and academia. There are several Cloud Computing middleware solutions available in the market. This paper proposes an approach and set of characteristics and metrics for comparing Cloud computing middleware based on functionality. Three popular open source middleware: Nimbus, Eucalyptus and OpenNebula, are also analyzed and evaluated on the basis of the proposed parameters. Future work will include more systems and an experimental benchmarking to study the relative performance.
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