抄録
Nowadays, ”Green IT” has become the important keyword for the sake of the construction of the society where the environmental protection and the economic growth dwell together. Regarding IT, content services is one of the most important services in the Internet and most of Internet Service Providers (ISPs) challenges to provide better content services. To provide content services efficiently, Content Distribution Networks (CDNs) have to be optimally constructed. In this paper, we introduce the examples of several major ISPs in Japan as the case studies of CDNs operation and execute simulation experiments of dynamic content allocation in CDNs of BBit-Japan using the optimal mirror server and content file allocation model.