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This paper presents new mechanisms for dynamic resource management in a cluster manager called Cluster-On-Demand (COD). COD allocates servers from a common pool to multiple virtual clusters (vclusters), with independently configured software environments, name spaces, user access controls, and network storage volumes. The authors' present experiments using the popular Sun GridEngine batch scheduler to demonstrate that dynamic virtual clusters are an enabling abstraction for advanced resource management in computing utilities and grids. In particular, they support dynamic, policy-based cluster sharing between local users and hosted grid services, resource reservation and adaptive provisioning, scavenging of idle resources, and dynamic instantiation of grid services.
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