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Cluster based web servers have been widely deployed by enterprises to accommodate the ever-increasing population of Internet users. But during the period of high client loads, web clusters may still fail to provide timely service to all the clients, and part of the clients may suffer unacceptable long delay. In order to provide better service to premium users, QoS schemes need be implemented in the web clusters. Controlling mechanisms for stand-alone web server have been studied in previous years, but it is still a challenging problem to design a QoS controller for web clusters. In this paper, the authors apply a fuzzy Proportional Integral (PI) controller to dynamically assign system resources for guaranteeing proportional connection delay ratio.
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