Scalability evaluation of an energy-aware resource management system for clusters of web servers

For green cluster computing resource management systems have to be energy-aware. CHERUB is such an energy-aware resource management system which works together with the Linux Virtual Server. Experiments in a small cluster setup with two nodes have shown the benefit of CHERUB. This paper presents necessary design changes to make CHERUB also work in big cluster setups. Our methodological approach is two-fold. First, we present unit measurements to evaluate the scaling of the re-implemented functions. Second, a cluster simulator is presented and validated which makes it possible to test CHERUB for backend clusters of arbitrary size.