基于P2P计算的动态多副本开销模型

在多个结点上保持副本是提高P2P或网格计算环境可用性的一个有效途径。不可靠的对等点和网络环境以及用户访问模式的多样性使得难以确定多少个副本能够满足用户高可用性的需求。文章提出了一种最小开销模型来预测和动态控制副本数量。为了隐藏系统中对等点的不可靠性,在考虑多副本的同时通过一种冗余机制预测系统中的副本数量。仿真结果表明,该系统具有更好的可用性和低的副本开销。

A Dynamic Multiple Replica Cost Model for P2P Computing

Replication on multiple nodes is an effective way to improve the availability in the P2P or grid environment. It is difficult to determine how many replicas can fulfill the user request of availability QoS ,because of the undependable peers,networks and diverse distributions of user access mode.Aiming to supply availability QoS at a low replica cost,we introduce a minimum cost model to predict the number of replicas and dynamically control the number of replicas.To mask the undependable peers in the system,we regard replication at the same time as a redundancy mechanic to predict a proper number of the replicas.The simulation results show that our system supplies a better availability at a low replica cost,