摘要： 副本机制是提高网格性能，降低客户端延迟的有效手段，副本放置策略是副本机制的关键问题。该文介绍了教育资源网格的体系结构，针对教育资源网格特殊的体系结构，提出了3种动态副本放置策略，并从不同的角度对它们进行了优化，在保持副本存储空间占用的前提下，降低了客户端延迟。实验表明了策略的有效性。

关键词: 网格, 副本, 副本放置, 教育资源

Abstract: Replica mechanism is the efficient method of improving grid performances and reducing client delay. Replica placement strategy is the key problem of replica mechanism. This paper introduces the architecture of education resource grid. According to the architecture, it presents three dynamic replica location strategies, optimizes three strategies from different aspects, and reduces client delay on the premise of keeping the storage space of replica. Experimental results show that strategies are effective.

Key words: grid, replica, replica placement, education resource

中图分类号: 

• TP393