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Data Grids are being built across the world as the next generation data handling systems to manage peta-bytes of inter organizational data and storage space. A data grid (datagrid) is a logical name space consisting of storage resources and digital entities that is created by the cooperation of autonomous organizations and its users based on the(More)
Current distributed data management systems implement internal consistency constraints directly within the software. If these constraints change over time, the software must be rewritten. A new approach towards data management system based on the dynamic execution of rules is discussed. By building upon the experiences gained with the Storage Resource(More)
[This is the first of a two-part story. The second part will appear in the April 2000 issue of D-Lib Magazine.] Abstract The preservation of digital information for long periods of time is becoming feasible through the integration of archival storage technology from supercomputer centers, data grid technology from the computer science community, information(More)
International data grids are now being built that support joint management of shared collections. An emerging strategy is to build multiple independent data grids, each managed by the local institution. The data grids are then federated to enable controlled sharing of files. We examine the management issues associated with maintaining federations of(More)
Archival storage systems must operate under stringent requirements, providing 100% availability while guaranteeing that data will not be lost. In this paper we explore the multiple interconnected subsystems that must be tuned to simultaneously provide high data transfer rates, high transaction rates, and guaranteed meta-data backup. We examine how resources(More)
The Distributed Object Computation Testbed (DOCT) Project is a collaboration led by the San Diego Supercomputer Center (SDSC) and funded by the Defense Advanced Research Projects Agency (DARPA) and the US Patent and Trademark Office (USPTO). The DOCT project was initiated with the objective of creating a testbed system for handling complex documents on(More)