Date Added: Oct 2010
Currently, collaboration or federation among cloud providers is gaining popularity in the research community. However, current research efforts in this context mainly focus on vertical supply chain collaboration model in which cloud providers will leverage homogeneous cloud services from other cloud providers for seamless provisioning. Nevertheless, in the near future, the authors can expect that hundreds of cloud providers will compete to offer services and thousands of users also compete to receive the services to run their complex heterogeneous applications on cloud computing environment. In this scenario, the existing collaboration models are not applicable. In fact, while clouds are typically heterogeneous and dynamic, the existing federation models are designed for static environments with homogeneous service requirements where a priori agreements among the parties are needed to establish the federation.