中文摘要：

在研究了文件内部访问倾向性特征的基础上，提出了一种新型的流媒体文件分块放置策略．它能够有效消除流媒体访问倾向性对服务器性能的负面影响，提高流媒体服务器的服务能力．

英文摘要：

This paper studies the characteristics of the intra-video skewness by a trace-based analysis. The analysis results show that the intra-video skewness probably leads to serious performance decline in case of traditional data placement in streaming servers. In order to solve this problem, the authors propose two novel data placement strategies. The first one is Symmetrical Pair Scheme. It can relieve the negative impact of the intra-video skewness to a great extent without extra system overhead. The second one is Symmetrical Replication Pair Scheme derived from the first method. It trades a little shows that streaming servers with performance improvement. redundant data for better system performance. The analysis the novel data placement strategies can obtain obvious system