This document discusses server consolidation algorithms for virtualized cloud environments. It begins with an introduction to cloud computing and virtualization. It then reviews several existing server consolidation algorithms from literature, including Sandpiper, Khanna's algorithm, and Entropy. Sandpiper aims to mitigate hotspots by migrating virtual machines between physical machines. Khanna's algorithm aims for server consolidation by packing virtual machines to minimize the number of physical machines needed. Entropy aims to minimize the number of migrations required during consolidation. The document evaluates the performance of these algorithms in a virtualized cloud test environment.