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Design issues and caching strategies for CD-ROM based multimedia storage

Shastri, Vijnan and Rajaraman, V and Jamadagni, HS and Rangan, Venkat P and SampathKumar, Srihari (1996) Design issues and caching strategies for CD-ROM based multimedia storage. In: Conference on Multimedia Computing and Networking 1996, JAN 29-31, 1996, SAN JOSE.

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CD-ROMs have proliferated as a distribution media for desktop machines for a large variety of multimedia applications (targeted for a single-user environment) like encyclopedias, magazines and games. With CD-ROM capacities up to 3 GB being available in the near future, they will form an integral part of Video on Demand (VoD) servers to store full-length movies and multimedia. In the first section of this paper we look at issues related to the single- user desktop environment. Since these multimedia applications are highly interactive in nature, we take a pragmatic approach, and have made a detailed study of the multimedia application behavior in terms of the I/O request patterns generated to the CD-ROM subsystem by tracing these patterns. We discuss prefetch buffer design and seek time characteristics in the context of the analysis of these traces. We also propose an adaptive main-memory hosted cache that receives caching hints from the application to reduce the latency when the user moves from one node of the hyper graph to another. In the second section we look at the use of CD-ROM in a VoD server and discuss the problem of scheduling multiple request streams and buffer management in this scenario. We adapt the C-SCAN (Circular SCAN) algorithm to suit the CD-ROM drive characteristics and prove that it is optimal in terms of buffer size management. We provide computationally inexpensive relations by which this algorithm can be implemented. We then propose an admission control algorithm which admits new request streams without disrupting the continuity of playback of the previous request streams. The algorithm also supports operations such as fast forward and replay. Finally, we discuss the problem of optimal placement of MPEG streams on CD-ROMs in the third section.

Item Type: Conference Paper
Publisher: SPIE - int soc optical engineering
Additional Information: Copyright of this article belongs to SPIE - int Soc Optical Engineering.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 07 May 2011 05:59
Last Modified: 17 Oct 2018 11:01
URI: http://eprints.iisc.ac.in/id/eprint/37103

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