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Over the Internet today, computing and communications environments are more complex and chaotic than classical distributed systems, lacking any centralized organization or hierarchical control. Peer-to-Peer network overlays provide a good substrate for creating large-scale data sharing, content distribution and application-level multicast applications. We present DistHash, a P2P overlay network designed to share large sets of replicated distributed objects in the context of large-scale highly dynamic infrastructures. The system uses original solutions to achieve optimal message routing in hop-count and throughput, provide an adequate consistency among replicas, as well as provide a fault-tolerant substrate. In this we present result proving that the system is able to scale to a large number of nodes, and it includes the fault tolerance and system orchestration mechanisms, added in order to assess the reliability and availability of the distributed system in an autonomic manner.