Novasky : Cinematic-Quality VoD in a P2P Storage Cloud

Novasky: Cinematic-Quality VoD in a P2P Storage Cloud

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Outline

• Introduction• Design•Measurement and evaluation• conclusion

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Introduction

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Novasky

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Introduction

• Storage cloud– Peers are inter-connected over high-bandwidth

network– storage space is reserved in each peer– pool storage spaces together– storage space can be accessed conveniently

• design, implement, deploy, and measure a VoD system based on P2P storage cloud

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Design

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Objective and Challenge• Objectiv– Build a P2P storage cloud– Cinematic-quality

• Challenges– Replacement– Demand and Supply

• Solution– coding-aware peer storage and replacement strategy– adaptive server push strategy

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Architectural Design

Management center : 1)Maintain metadata2)Authentication3)Maintain current status of peers

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Architectural Design

Media servers: feed a rich repository of videos to a large number of users

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Architectural Design

P2P storage cloud: 1) pool local storage space together 2) organized into a mesh topology 3) exchange information periodically

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Peer Storage and Replacement

• Three aspects to consider– cache a number of videos– Uploading a certain part of video– Replication

• Store a part of the video and promote diversity

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缓存饱和时 按最不常用顺序进行排序

生成编码的片断并保存 删除视频源文件

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Reed-Solomon codes for segment

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Measurement and

Evaluation

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Durable video availability

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Durable video availability

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Storage efficiency

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Load balancing

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Cost effectiveness of the server push-to-peer strategy

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Cost effectiveness of the server push-to-peer strategy

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Cost effectiveness of the server push-to-peer strategy

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Transmission overhead

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CPU and memory consumption

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conclusion

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conclusion

• Design and implement Novasky• Propose two unique mechanism– Coding-aware peer storage and replacement

strategy– Adaptive server push strategy

• Offer insights which are helpful towards future designs of P2Pstorage cloud systems

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Thanks