Barycenter-based placement strategy towards improving replicas distribution quality

Abstract

Replication of data on variant sites is a well-known technique used to face many challenges in data grid systems. In this respect, selecting the appropriate site to place a new replica is crucial to improve data grid performance. Many replicas placement strategies have been proposed in the literature. Each one of them targets a specific goal. In this paper, we try to reach a new goal which is the improvement of the replicas distribution quality. To this purpose, a new placement strategy is proposed in which the barycenter method is applied. This strategy allows to reduce the total remote accesses cost, to increase the quality of service, and to ensure that the benefits of the new replica placement will remain for a long-term. We evaluate the strategy through the OptorSim simulator. Results show that the new strategy achieves significant improvement in terms of replicas distribution quality and total execution time, in the short-term as well as in the long-term.