这篇文章描述了PAST的设计，past是一个大规模、基于internet的、全局存储实体。pats提供扩展性、高可用性、持久性以及安全性支持。PAST 是一个点对点的internet应用，并且完全是自组织的。-　This paper sketches the design of PAST, a large-scale,

Internet-base,global storage utility that provides seala-

bility high availability　persistence and security.　PAST

is a peer-to-peer Internet application and is entirely self-

organizing. PAST nodes serve us access points for clients,

participate in the routing of client requests, and contribute

storage to the system. Nodes are not trusted, they may join

the system at any time and may silently leave the system

without warning. Yet, the system is able to provide strong

assurances, efficient storage access, load balancing and

scalability

　Among the most interesting aspects of PAST s design are

(I) the Pastry location and routing scheme, which reliably

and efficiently routes client requests among the PAST nodes,

has good network locality properties and automatically re-

solves node failures and node additions　(2) the use of ran-

domization to ensure diversity in the set of nodes that store a file s replicas and to