VMware Infrastructure 3 provides a set of distributed infrastructure services that make the entire IT environment more serviceable, available, and efficient. Working with VMware ESX 3, VMware VirtualCenter 2, and VMware VMotion, VMware Distributed Resource Scheduler (DRS) dynamically allocates resources to enforce resource management policies while balancing resource usage across multiple ESX hosts. This performance study focuses on understanding the effectiveness and scalability of DRS algorithms. It identifies various scenarios in which you can benefit from DRS and explains how to configure your environment to take best advantage of DRS.
The pdf version of the whitepaper can be found at http://www.vmware.com/files/pdf/drs_performance_best_practices_wp.pdf