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This e-book constitutes the refereed complaints of the 4th foreign Workshop on Interactive allotted Multimedia structures and Telecommunication providers, IDMS'97, held in Darmstadt, Germany, in September 1997. The forty-one revised complete papers provided within the e-book have been chosen from over a hundred submissions. The papers are prepared in sections on media coding and content material processing, improvement and interoperability, on-demand platforms, multicast and FEC, video server and structures, video transmission, construction and authoring, multimedia purposes, mobility, CSCW and approach functionality, MM verbal exchange over ATM networks, CSCW and teleteaching, QoS for media displays, QoS and scaling.
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201–207, 2000 8. Jung-Min Choi, Seung-Won Lee, Ki-Dong Chung: A Muticast Delivery Scheme for VCR Operations in a Large VOD System. 555–561, June 2001 An Effective Failure Recovery Mechanism with Pipeline Computing 23 9. org/ 10. T. Chang, S. Shim, and D. Du: The Designs of RAID with XOR Engines on Disks for Mass Storage Systems. 181–186, March 1998 11. Prashant J. Shenoy, Harrick M. Vin: Failure recovery algorithms for multimedia servers. 1–19, 2000 12. Leana Golubchik, Richard R. Muntz, Cheng-Fu Chou, Steven Berson: Design of Fault-Tolerant Large-Scale VOD Servers: With Emphasis on High-Performance and Low-Cost.
To rebuild the video blocks stored in the failure MMS node, sequential several exclusive OR stages are necessary. For each stage, the two blocks are needed to compute exclusive OR operation at a time. Based on this characteristic, the stages are distributed into MMS nodes so that the network saturation in the recovery node is solved. In addition, the CPU computing power of MMS nodes can be utilized without impairing the QoS streams. Fig. 2 shows the architecture of RS-PCM and the flow of video blocks in the VODCA server.
Figure 4 shows the performances comparison among re-caching algorithm, Greed algorithm, and the proposed replacing algorithm when the request rate is changed. Now, the normalized cost is defined by the total reduction cost/the total cached size. The re-caching means that the proxy server executes the proposed caching algorithm with the new request rate after removing all cached data. As shown in Figure 4, both the re-caching and the proposed replacing algorithm can provide almost same efficiency, but the performance of Greed algorithm seriously deteriorates.