一种基于数据网格的动态副本管理策略研究

A research of dynam ic replication management strategy based on data grid

副本管理是数据网格中的一个研究热点,它能提高网格环境中数据的可获得性和容错性.在对传统数据网格中主流的副本管理技术进行深入研究后,提出了一种基于数据网格的动态副本管理策略,该策略包含能根据文件访问热度自动增加副本的动态副本创建方法、基于GridFTP的副本选择方法和结合副本创建时间、访问次数、副本文件大小的副本置换方法.仿真实验结果表明,当用户对资源的访问具有时间相关性时,提出的动态副本管理策略与OptorSim网格仿真器内置的5种副本管理策略相比有着较大的性能优势.

Replication management has become a hot research area in data grid. It has improved availability and fault tolerant of data in grid computing environment. This paper proposed a management strategy of the dynamic replication to the datagrid on the basis of deep research of the mainstream of replication management tech- nology from traditional datagrid. Replication management strategy contains the creation method of dynamic replication that can automatically increase replication according to the frequency of the access file,the selection method of replication based on the GridFTP and the replacement method of the replication combine with the establishment time, access times and file size. The simulation experiments indicated that comparing the management strategy of dynamic replication with the five kinds of replication management strategy in the OptorSim grid simulator, the new strategy exhibited much more performance advantages with the resource access relate to time.