Abstract: As the Globus resource management (GRM) model lacks QoS mechanism, this paper proposes an extended framework for GRM, GRMF, which can support dynamic QoS renegotiation. WS-Agreement specification is extended to support renegotiation and modification of the agreement terms during the service provision. Then, integration of the extended WS-Agreement framework with GRM model is studied. The dynamic QoS renegotiation-supported GRMF is devised accordingly. Feasibility of the framework is validated by realizing key web services. The theoretical analysis and experimental results show that the framework can improve the success ratio of tasks, and allow better resource load balancing within the grid.

Key words: re-negotiation, QoS, WS-Agreement, service level agreement (SLA), job description language (JDL)