Distributed redundancy strategy in P2P environment

Lei Yang; Zhi-guang Qin; Can Wang; Hao Yang
February 2012
International Journal of Digital Content Technology & its Applic;Feb2012, Vol. 6 Issue 3, p148
Academic Journal
P2P storage architecture plays an important role in distributed storage systems. For P2P dynamic environment, the sufficient redundant data must be maintained to ensure the data availability. System will pay various costs to maintain redundant data. In this paper, the costs of the bandwidth that are respectively caused by the methods of replication and erasure coding are qualitatively analyzed based on Markov chain model. Combined the advantage of replication and erasure coding, a new hybrid redundancy strategy is proposed. Just as replication, the downloaded files automatically are viewed as shared files for next downloading. Like erasure coding, when the availability of one file needs to be repaired, anyone of peers which store the fully copy of this file is assigned to generate and distribute new fragments. The analysis result shows that the hybrid redundancy strategy can maintain the appropriate level of redundancy and save more bandwidth than the traditional redundancy strategy in a variety of network environment.


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