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This paper presents CPM, a unified approach that exploits server multicast, assisted by peer downloads, to provide efficient Video-on-Demand (VoD) in a service provider environment. They describe their architecture and show how CPM is designed to dynamically adapt to a wide range of situations including highly different peer-upload bandwidths, content popularity, user request arrival patterns (including flash-crowds), video library size, and subscriber population. They demonstrate the effectiveness of CPM using simulations (based on the an actual implementation codebase) across the range of situations described above and show that CPM does significantly better than traditional unicast, different forms of multicast, as well as peer-to-peer schemes. Along with synthetic parameters, they augment their experiments using data from a deployed VoD service to evaluate the performance of CPM.
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