期刊论文

中文

计算机科学

1002-137X

2011

38

4

80-83

10.3969/j.issn.1002-137X.2011.04.015

国家自然科学基金项目（70671051） 国防基础研究课题（A3720060121）资助

本校为其他机构

可靠性是可信性研究的基本内涵之一,也是P2P（Peer-to-Peer）存储系统研究的关键。P2P存储系统结点具有高动态特征,结点频繁地上下线给系统的可靠性分析带来困难。结点的暂时离线会增加副本数量,从而导致系统不必要的损耗。较多的副本数量会增加系统的可靠性,但是同时会导致系统的一致性维护成本增加。而较少的副本数量又会导致系统的可靠性显著降低。针对副本的数量和可靠性之间的关系,采用随机Petri建立了P2P存储系统的可靠性模型并加以分析,围绕数据可靠性度量要求和数据副本的数量建立关系模型,从理论上指明研究系统可靠性的目的和基本原则,这可以在系统组建之初帮助优化系统的设计。

Reliability is one of the basic connotations of dependability,and it is also the key of P2P Storage Systems study.P2P storage system nodes are highly dynamic.That nodes are from online to offline frequently will lead difficulty to system reliability analysis.If increasing the number of copies because nodes are temporarily offline,it will cause system to unnecessary outage.The larger number of copies will increase system reliability,but it will also cause the system to increase the cost of consistency maintenance.And the fewer number of copies w...