In recent years, cloud computing has steadily increased in popularity and penetrated not only the consumer markets but also the enterprise systems of companies. In particular, operators of large-scale IaaS (Infrastructure as a Service) are expanding services globally. Of late, they have wielded as their weapon an inexpensive yet vast re-source power. Also gaining visibility is a tendency to gain entry to PaaS (Platform as a Service), exemplified by the big data analysis platforms of HPC and DWH.