关键词: 教育资源, 数据网格, 动态复制, 复制选址

Abstract: Within data grid environments, dynamic replication is a general mechanism to improve performance and availability for distributed applications. In the paper, we firstly review the dynamic replication strategies till now. As the experimentally efficient strategies are based on single-location algorithms, they are not suitable for geographically broad grids with long latency. To address such issues, three multiple-location strategies are proposed, which are converted into classical mathematic problems that can be solved by some famous approximation algorithms. After explaining the strategies are suitable for resource management in the remote education, we do some experiments in the topology of EU Data Grid Testbed 1. The simulation results demonstrate that our multiple-location strategies significantly improve the bandwidth consumption and access latency in data grid.

Key words: Education resources, Data Grid, Dynamic Replication, Replica Placement