CoreGRID Network of Excellence - European Grid Research

Grid Computing has succeeded in establishing production Grids serving various user communities all around the world. The emerging Web technologies have already affected Grid development; the latest solutions from peer-topeer networking also need to be considered in order to successfully transform the currently separated production Grids to a World-Wide Grid solving the big problem of Grid Interoperability. This paper gathers the promising peerto- peer technologies and investigates their applicability in current Grids. We state the requirements of a scalable and adaptable high-level brokering architecture, and dene the necessary routing mechanisms that can efciently operate this peer-to-peer Grid meta-brokering architecture.

ExtendingWS-Agreement for dynamic negotiation of Service Level Agreements

CoreGRID Technical Report TR-0172 [pdf]:

Services in commercial or scientific environments often need to be delivered at a guaranteed service level. This becomes even more important, if composition of services is required, as results will become available for the requester within a predictable timeframe only if the orchestration process may create Service Level Agreements (SLAs) for the individual services. WS-Agreement is a proposed recommendation of the Open Grid Forum (OGF) defining a language and a protocol to create SLAs. As the current version of the specification of WS-Agreement provides only a simple, one-step approach for the creation of SLAs the GRAAP working group of the OGF started working on a more sophisticated protocol allowing multi-step negotiations to create agreements. In this paper we present the approach for negotiations of SLAs using WS-Agreement under specification at the OGF. We describe the state of the work and give an outlook of the next steps until the specification will become a proposed recommendation.

Considerations for negotiation and monitoring of Service Level Agreements

CoreGRID Technical Report TR-0167 [pdf]:

Service Level Agreements (SLA) may be used to establish agreements on the quality of a service between a service provider and a service consumer. This report gives an overview on current work done on negotiation and re-negotiation of SLAs within the CoreGRID Institute on Resource Management and Scheduling and in the Grid Resource Allocation Agreement Protocol Working Group (GRAAP-WG) of the Open Grid Forum (OGF). An introduction is given on the proposed OGF recommendation WS-Agreement and its state, followed by a presentation of use-cases for negotiation stemming from from implementations of WS-Agreement. We then describe the approaches currently under discussion in the GRAAP-WG to be consolidated to a negotiation protocol for Service Level Agreements using WS-Agreement. Since the working group of the OGF has not yet consolidated the approaches presented there is not yet a single proposal for a negotiation protocol. However, during the last meeting of the working group the members identified the three approaches that will now be used as a base to specify the protocol for negotiation and re-negotiation of SLAs. Furthermore, the report discusses built-in functionality ofWS-Agreement and additional requirements for the monitoring of SLAs.

Last Updated ( Wednesday, 24 September 2008 )


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