, Volume 2, Issue 4, pp 323-339
Date: 01 Apr 2005

The Relational Grid Monitoring Architecture: Mediating Information about the Grid

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We have developed and implemented the Relational Grid Monitoring Architecture (R-GMA) as part of the DataGrid project, to provide a flexible information and monitoring service for use by other middleware components and applications.

R-GMA presents users with a virtual database and mediates queries posed at this database: users pose queries against a global schema and R-GMA takes responsibility for locating relevant sources and returning an answer. R-GMA’s architecture and mechanisms are general and can be used wherever there is a need for publishing and querying information in a distributed environment.

We discuss the requirements, design and implementation of R-GMA as deployed on the DataGrid testbed. We also describe some of the ways in which R-GMA is being used.

L. Field: Now at CERN, Switzerland.
J. Leake: Under contract from Objective Engineering Ltd.