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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)
[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)
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)
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)
This paper analyses HPSS performance and, to a lesser extent, characterizes the SDSC HPSS workload, utilizing per-file transfer logs. The performance examined includes disk cache hit rates, disk file open times, library tape mount times, manual tape mount times, transfer speeds and latencies. For workload characterization, we examine daily activity in terms(More)
The integrated Rule-Oriented Data System (iRODS) is a data grid that manages distributed data. The iRODS system is used to support data sharing, data publication, data preservation, and data analysis. These data management applications depend upon very similar data manipulation capabilities, but differ in terms of their management policies. The iRODS data(More)