Power Optimization in High Availability Server Cluster

Building a server cluster is one of the methods to provide high availability web server. However, not all of the servers in the cluster are utilized continuously. This condition leads to wasted energy consumed by unused servers. Therefore, to prevent excessive power consumption we need to optimize energy usage. This paper proposes an automated power optimization in high availability server cluster based on queuing model theory. The power is managed by allocating optimal power to each member in the cluster based on received workload. The proposed method could save power up to 70 Watt per checking period (25 seconds).