Negotiating and Enforcing QoS and SLAs in Grid and Cloud Computing

Emerging grid computing infrastructures such as cloud computing can only become viable alternatives for the enterprise if they can provide stable service levels for business processes and SLA-based costing. In this paper we describe and apply a three-step approach to map SLA and QoS requirements of business processes to such infrastructures. We start with formalization of service capabilities and business process requirements. We compare them and; if we detect a performance or reliability gap, we dynamically improve performance of individual services deployed in grid and cloud computing environments. Here we employ translucent replication of services. An experimental evaluation in Amazon EC2 verified our approach.