Dynamic SLA Negotiation Based on WS-Agreement

A typical task of a grid level scheduling service is the orchestration and coordination of resources in the grid. Especially the co-allocation of resources makes high demands on this service. Co-allocation requires the grid level scheduler to coordinate resource management systems located in different domains. Provided that the site autonomy has to be respected negotiation is the only way to achieve the intended coordination. Today, it is common practice to do this by using web service technologies. Furthermore, service level agreements (SLAs) emerged as a new way to manage usage of resources in the grid and are already adopted by a number of management systems. Therefore, it is natural to look for ways to adopt SLAs for grid level scheduling. In order to do this, efficient and flexible protocols are needed, which support dynamic negotiation and creation of SLAs. In this paper we propose and discuss extensions to the WS-Agreement protocol addressing these issues.