Abstract: Within data grid environments，dynamic replication is a general mechanism to improve performance and availability for distributed applications.In the paper，the authors 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，the authors propose three multiple-location strategies，which are converted into classical mathematic problems that can be solved by some famous approximation algorithms.Then，the authors explain that the strategies are suitable for resource management in the large-scale distributed resource management.

Key words: data grid, dynamic replication, replica placement, large-scale distributed resource management

摘要： 动态复制技术对于提高数据网格的性能非常重要。对目前的动态复制策略进行了综述，鉴于目前效果较好的动态复制策略均为单选址算法，对于延迟较大、分布较广的网格存在很大局限性，提出三种多选址的动态复制策略，并将其转化为经典的数学问题进行求解。然后，给出了多选址动态复制策略在大规模分布式资源管理中的应用。

关键词: 数据网格, 动态复制, 复制选址, 大规模分布式资源管理