Resource consumption-aware QoS in cluster-based VOD servers

Resource consumption-aware QoS in cluster-based VOD servers

Dongmahn Seo^a, Joahyoung Lee^a, Yoon Kim^a, Chang Yeol Choi^a, Manbae Kim^a and Inbum Jung^{, a,
a}Department of Computer Science and Engineering, Kangwon National University, 192-1 Hyoja 2-Dong, Chuncheon, Kangwon Do 200-701, Republic of Korea
Received 13 August 2005;  revised 21 April 2006;  accepted 3 July 2006.  Available online 13 October 2006.

Abstract

For Video-On-Demand (VOD) systems, it is important to provide Quality of Service (QoS) to more clients under limited resources. In this paper, the performance scalability in cluster-based VOD servers is studied with several grouping configurations of cluster nodes. To find performance bottlenecks, the monitoring functions are employed and the maximum QoS streams are measured under the various requests including VCR functions. To support more user friendly interface, an embedded set-top model is suggested for the QoS of TV clients. From our detailed experiment results, a new admission control method is proposed that is based on available system resources and the actual amount of resource consumed for QoS streams. The proposed method provides not only more scalable QoS in cluster-based VOD servers but also the enhancement of resource utilization by guaranteeing the maximum number of QoS streams.

Keywords: VOD; Cluster system; Streaming media; QoS; Resource aware; Parallel processing

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