Virtual Organization Clusters are systems comprised of virtual machines that provide dedicated computing clusters for each individual Virtual Organization. The design of these clusters allows individual virtual machines to be independent of the underlying physical hardware, potentially allowing virtual clusters to span multiple grid sites. A major challenge in using Virtual Organization Clusters as a grid g abstraction arises from the need to schedule and provision physical resources to run the virtual machines. This paper describes a virtual cluster scheduler implementation based on the Condor High Throughput Computing system. By means of real-time monitoring of the Condor job queue, virtual machines that belong to individual Virtual Organizations are provisioned and booted. Jobs belonging to each Virtual Organization are then run on the organizationspecific virtual machines, which form a cluster dedicated to the specific organization. Once the queued jobs have executed, the virtua...
Michael A. Murphy, Brandon Kagey, Michael Fenn, Se