中文摘要：

当前的副本创建策略在选取热点数据时往往没有对访问突变做出反应，造成副本频繁创建和删除的网格动荡。针对上述情况，本文引入文件访问趋势的概念，提出一种基于访问趋势的数据网格动态副本创建策略（ADRS ），ADRS根据历史数据访问情况计算出文件的访问趋势，然后根据文件的访问趋势决定数据副本的创建和删除。仿真结果表明，在随机访问模式下，对比最近访问最大权重算法（LALW），ADRS 能有效地降低数据副本的创建次数，提高网格副本利用率并且在节点空间有限的情况下不会影响网格的效率。

英文摘要：

Current hot data select in replica creation strategies didn’t react to data mutation and resulting in replicas create and delete frequently and then caused grid thrashing .According to this ,an access-tendency based dynamic replica creation strategy （ADRS） is proposed .ADRS calculate file’s access-tendency based on historical data access ,and then according to file’ s access-tendency create or delete replica .T he simulation results show that ADRS can reduce the replica create times and increase replica usage rate for random access pattern compared to Latest-access-largest-weight algorithm （LALW） and didn’t affect the efficiency w hen node’s space is limited .