On-demand global server load balancing system and method of use

A method and system for measuring performance and balancing workload of sites, virtual clusters and servers within the virtual clusters is provided. A monitor measures and computes performance metrics at each level. Servers are individually measured for performance and based on average response time of servers that are members of a virtual cluster, a virtual cluster performance metric may also be computed. Further, the performance of a site may be profiled based on the virtual cluster metrics and/or server performance metrics. Based at least in part on these performance metrics, a domain oriented request may be resolved and routed based in part on the performance metrics at each level virtual cluster and server. In this manner, a request may be directed to a destination server to achieve higher performance and efficiencies for the requesting client while at the same time balancing workload among possible servers available to service the request.