DI-GRUBER: A Distributed Approach for Grid Resource Brokering

Managing usage SLAs within large environments that integrate participants and resources spanning multiple physical institutions is a challenging problem. Maintaining a single unified usage SLA management decision point over hundreds to thousands of jobs and sites can quickly become a bottleneck in terms of reliability as well as performance. DI-GRUBER, an extension to GRUBER, was developed as a distributed grid Usage SLA-based resource broker that allows multiple decision points to coexist and cooperate in real-time. DI-GRUBER ultimately addresses issues regarding how usage SLAs can be stored, retrieved and disseminated efficiently in a large distributed environment. The key question this paper addresses is the scalability and performance of DI-GRUBER in large Grid environments. We conclude that as little as three to five decision points could be enough in an environment with 300 sites and 60 VOs, an environment ten times larger than today’s Grid3.