CoS-Based Grid QoS Description Language

In service-oriented grid environment, seamless quality of service (QoS) delivery is one of its most important objectives. To reduce the overhead of QoS management, this paper proposes a CoS-based grid QoS description language (CGDL) and a corresponding Grid QoS management framework (CGMF). As a lightweight service level agreement (SLA), Class of Service (CoS) is predefined by the grid service provider to detail grid QoS. CGDL is to specify CoSs and to present mapping relationships between different QoS layers. Based on Web services resource framework (WSRF) and XML, CGDL is compatible with Web service definition language (WSDL) which is used for describing functions of services. CGMF is founded on both CGDL and mobile agent for monitoring grid QoS. A grid service of file storage is presented to show how to manage grid QoS with the help of CGDL. The result shows that CGDL effectively reduces the negotiating cost using a few CoSs instead of complex SLAs.