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 e.g., LDAP servers, are individually measured for performance, e.g., response time, 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, i.e., site, 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.