Research On Replica Management Strategies Based On Storage In Data Grid

More data-intensive and high-performance applications are required in the modern scientific research and application areas. Because lacking of data sharing and cooperation, many information systems are separated and isolated, and difficult to communicate with each other. Data Grid provides the services which contain access, storage, transformation and management of data files. It supports the distributed and intensive-data systems, and solves the problems mentioned above.The replica management strategies are one of the popular researches of Data Grid. This paper analyzes the structure and characteristics of the replica management system, and researches on the replica management strategies which contain several dynamic replication strategies. Based on the merits and demerits of different dynamic replication strategies, this paper improves on the system model and puts forward a system model based on regional storage and a replica creation arithmetic based on the access trend.Through the DataGrid simulator OptorSim, the improved arithmetic is simulated. The simulation process contains the realization of the configuration files, job submitting, file access mode and the input of simulation parameters. At last, the simulation data is analyzed and compared with each other.After improving system model and the replica creation arithmetic, the performance of Data Grid is improved. For example, the data response time and network bandwidth are reduced, etc. Besides, through modifying OptorSim, the simulation environment is more like a real Data Grid, and simulation results are also more persuasive.