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Because of the dynamic nature and an instability of grid computing environment, system behavior in terms of QoS depends crucially on the selection of appropriate subset of the available resources. Thus, a well-defined system model that provides high system availability using a scheduling mechanism is required. In this paper, we propose the SLA based Policy Administrator (SPA) with QoS constraints with the resource scheduling scheme to find optimal resources for satisfying QoS requirements in terms of deadline as well as profit. Also, we demonstrate detailed workings of the proposed schemes with the SPA.