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Architecture of monitoring elements for the network element modeling in a Grid infrastructure

Architecture of monitoring elements for the network element modeling in a Grid infrastructure. Authors: Augusto Ciuffoletti Tiziana Ferrari Antonia Ghiselli Cristina Vistoli. Presenter: Sergio Andreozzi INFN-CNAF Bologna (Italy) sergio.andreozzi@cnaf.infn.it. OUTLINE.

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Architecture of monitoring elements for the network element modeling in a Grid infrastructure

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  1. Architecture of monitoring elements for the network element modeling in a Grid infrastructure Authors: Augusto Ciuffoletti Tiziana Ferrari Antonia Ghiselli Cristina Vistoli Presenter: Sergio Andreozzi INFN-CNAF Bologna (Italy) sergio.andreozzi@cnaf.infn.it

  2. OUTLINE • The context of this proposal • Motivations • Terms and concepts • Diagram and examples CHEP 2003 - March, 27 2003

  3. The context of this work • Promoted by INFN-CNAF (Bologna, Italy) • Currently discussed in both: • GLUE (Grid Laboratory Uniform Environment) context: collaboration effort promoted by DataTAG and iVDGL projects focusing on interoperability between US and EU HENP Grid middlewares • GLUE Schema for the Grid Information Service • GGF NM-WG CHEP 2003 - March, 27 2003

  4. MOTIVATIONS • A (Grid) computation requires three kinds of resources: • Storage, Computing, and Communication resources • Grid aware applications need to know the characteristics of such resources, in order to setup their execution environment • Modeling communication resources needs some simplifying assumption in order to decrease the N2 complexity of the interconnection structure • we want to model differentiated services; • we want to describe (and control) the measurement infrastructure. CHEP 2003 - March, 27 2003

  5. Partitioning the Grid into network domains • Services can be organized into network domains on the base of the quality of the connection • Communication bottlenecks should materialize between domains • From the viewpoint of a grid-aware computation, only communication between domains should be permanently monitored • Still N2 complexity, but now N is related to the number of domains CHEP 2003 - March, 27 2003

  6. Terms and conceptsEdge Service, Connectivity and Network Domain • Edge Service: service that uses or monitor the communication infrastructure; • Connectivity:is a metric that reflects the quality of communication through a path between two Edge Services • Network Domain: • identified by a URI • disjointed set of edge services • it communicates with other (network) domains using network services • it is said to be qualified if its internal connectivity is estimated higher than that of any adjacent Network Service. CHEP 2003 - March, 27 2003

  7. Terms and conceptsNetwork Service • Network Services: • offers unidirectional communication between two domains • it is characterized by several characteristics • since these characteristics are dynamics, each of them is associated to an observation (instance of the information obtained by applying the measurement methodology) • Characteristics are one-way, but the presence of two-way characteristics can be accommodated when necessary as an approximation of the one-way ones CHEP 2003 - March, 27 2003

  8. Terms and conceptsTheodolite service • Theodolite service: • it observes the characteristics of the communication infrastructure • it offers a method for on-demand observation • it should be placed near an access points of a Domain, so that it measures the quality of the infrastructure between its domain and the connected ones CHEP 2003 - March, 27 2003

  9. Facing temporary or permanent inconsistencies of domains VLAN – Lev 2 D: CNAF-CERN D: INFN-CNAF D: CERN CHEP 2003 - March, 27 2003

  10. The UML Class Diagram CHEP 2003 - March, 27 2003

  11. REFERENCE • DataTAG Project • http://www.datatag.org • Grid Laboratory Uniform Environment (GLUE) DataTAG WP4 and iVDGL Interoperability Group version 0.1.2 • http://www.hicb.org/glue/glue-v0.1.2.doc • GLUE Schema for the Network Element • http://www.di.unipi.it/~augusto/gluedomains/ • GLUE Schema for Computing and Storage Elements • http://www.cnaf.infn.it/~sergio/datatag/glue CHEP 2003 - March, 27 2003

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