The Reaserch Of Web QoS Control Based On Cluster Servers

The QoS contrl of Web Server and the load balancing stategy of cluster were separated in the old reaserch .This separation made the load balancing stategy didn't take the type of QoS for HTTP request into consideration. The load balancing stategy directly influenced the systerm of web server cluster. Load balancing is a important factor in load distribute.Based on the Web QoS control of the web cluster, we developed an dynamic load balancing arithmetic depending on the calculation ability of every back-end server called adaptive nearest neighborhood(ANN), which operated under the three layers of the system construction in isomerous environment. We made a conclusion that under the same load, ANN arithmetic can improve the efficiency of every back-end servers, the response time is much shorter and can give the answer faster and more exactly. Via imitational experiments, we proved the arithmetic to be correct and effective.