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As a Distributed Hash Table (DHT), Skip Graph routing overlays are exploitedin several peer-to-peer (P2P) services, including P2P cloud storage. The fullydecentralized replication algorithms that are applicable to the SkipGraph-based P2P cloud storage fail on improving the performance of the systemwith respect to both the availability of replicas as well as their responsetime. Additionally, they presume the system as homogeneous with respect to thenodes' latency distribution, availability behavior, bandwidth, or storage. Inthis paper, we propose Pyramid, which is the first fully decentralized utility-and locality-aware replication approach for Skip Graph-based P2P cloud storagesystems. Pyramid considers the nodes as heterogeneous with respect to theirlatency distribution, availability behavior, bandwidth, and storage. Pyramid isutility-aware as it maximizes the average available bandwidth of replicas pertime slot (e.g., per hour). Additionally, Pyramid is locality-aware as itminimizes the average latency between nodes and their closest replica. Oursimulation results show that compared to the state-of-the-art solutions thateither perform good in utility-awareness, or in locality-awareness, ourproposed Pyramid improves both the utility- and locality-awareness of replicaswith a gain of about 1.2 and 1.1 times at the same time, respectively.

Decentralized utility- and locality-aware replication for heterogeneous DHT-based P2P cloud storage systems