基于双层ID空间的Peer-to-Peer文件系统设计与实现

提出并实现了一种建立在Peer-to-Peer搜索策略上的自组织，自适应，高效和可靠的文件系统DISPES（Double ID Space Based Peer-to-peer File System)。它在双层ID空间中构造虚拟存储节点，不仅有效地取得了文件系统的负载均衡，提高系统利用率，而且保证了动态环境中文件的可靠，快速获取，试验数据表明，DISPFS在系统接近满负荷运行和文件插入/删除操作频繁的双重压力下依然保持优良的性能。

Design and Implementation of Double ID Space Based Peer-to-Peer File System

The design and the implementation of DISPFS (double ID space based peer-to-Peer file system), a file system based on double ID space, provide a new method to solve 2 key points in file system: load balancing and file availability. In DISPFS, the base ID space provides virtual storage nodes to approach to system load balancing. The virtual storage node maintains k replicas of each file in its responsibility through which strong availability is guaranteed. The upper ID space offers efficient file distribution and file query through excellent peer-to-peer search service. DISPFS is an efficient and reliable peer-to-peer file systems, and it remains good performance under the conditions of heavy storage overhead and frequent file inserting or file disclaiming.