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The Scientific World Journal
Volume 2014 (2014), Article ID 767016, 10 pages
Research Article

Efficient Dynamic Replication Algorithm Using Agent for Data Grid

1Department of Computer Science and Engineering, Amity School of Engineering and Technology, Bijwasan, New Delhi 110061, India
2School of Mathematics and Computer Applications, Thapar University, Patiala 147004, India

Received 7 August 2013; Accepted 28 January 2014; Published 24 March 2014

Academic Editors: J. H. Sossa and L. Xiao

Copyright © 2014 Priyanka Vashisht et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In data grids scientific and business applications produce huge volume of data which needs to be transferred among the distributed and heterogeneous nodes of data grids. Data replication provides a solution for managing data files efficiently in large grids. The data replication helps in enhancing the data availability which reduces the overall access time of the file. In this paper an algorithm, namely, EDRA using agents for data grid, has been proposed and implemented. EDRA consists of dynamic replication of hierarchical structure taken into account for the selection of best replica. Decision for selecting the best replica is based on scheduling parameters. The scheduling parameters are bandwidth, load gauge, and computing capacity of the node. The scheduling in data grid helps in reducing the data access time. The distribution of the load on the nodes of data grid is done evenly by considering scheduling parameters. EDRA is implemented using data grid simulator, namely, OptorSim. European Data Grid CMS test bed topology is used in this experiment. The simulation results are obtained by comparing BHR, LRU, No Replication, and EDRA. The result shows the efficiency of EDRA algorithm in terms of mean job execution time, network usage, and storage usage of node.