中文摘要：

分布式存储统系统的可靠性主要取决于系统采用何种数据放置策略来保证数据在网络中各结点的有效分配。总结了设计数据放置策略所需考虑的关键问题和衡量数据放置策略的标准，重点讨论了已有的几种放置策略，在Gossip副本更新算法思想的基础上，提出一种可适应动态网络环境的基于存储转发的随机放置策略，并通过测试验证了该策略对系统可靠性和性能的影响。

英文摘要：

In a distributed storage system, the availability and reliability depends on the appropriate selection of data placement strategies, which must ensure the effective data distribution among nodes of the network. In this paper it summarizes the key factors to be taken into con- sideration in data placement strategy design and in evaluation criteria of it, and emphasizes the main data placement strategies applying to the current system. We propose a store - forward - based random placement strategy for dynamic network based on the notion of Gossip copy update algorithm and reports on the reliability and performance of the system that the strategy impacted which have been validated by tests.