Abstract
Data replication is one of the best known strategies to achieve high levels of availability and fault tolerance, as well as minimal access times for large, distributed user communities using a world-wide Data Grid. In certain scientific application domains, the data volume can reach the order of several petabytes; in these domains, data replication and access optimization play an important role in the manageability and usability of the Grid. In this paper, we present the design and implementation of a replica management Grid middleware that was developed within the EDG project [European DataGrid Project (EDG), http://www.eu-egee.org] and is designed to be extensible so that user communities can adjust its detailed behavior according to their QoS requirements.
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