Simulation Analysis of Download and Recovery Processes in P2P Storage Systems

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Executive Summary

Peer-to-peer storage systems rely on data fragmentation and distributed storage. Unreachable fragments are continuously recovered, requiring multiple fragments of data (constituting a "Block") to be downloaded in parallel. Recent modeling efforts have assumed the recovery process to follow an exponential distribution, an assumption made mainly in the absence of studies characterizing the "Real" distribution of the recovery process. This paper aims at filling this gap through a simulation study. To that end, the authors implement the distributed storage protocol in the NS-2 network simulator and run a total of seven experiments covering a large variety of scenarios. They show that the fragment download time follows approximately an exponential distribution.

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