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Modeling and Dimensioning Hierarchical Storage Systems for Low-Delay Video Services
July 2003 (vol. 52 no. 7)
pp. 907-919

Abstract—In order to cost-effectively accommodate a large number of titles in a video system, a hierarchical storage system can be used. In this system, not-so-popular video files are stored in a tertiary level such as a disk/tape library. These files are transferred, or “staged,” to a secondary level composed of magnetic disks before being streamed to the users. This system overcomes the current limitations in using disk/tape libraries to stream videos and resolves the bandwidth difference between staging and streaming. In this paper, we present, via analysis, a model of the system and determine the minimum storage and bandwidth required, at each level, to meet a given user delay goal. We also analyze a number of system operations pertaining to whether or not a file is played while it is being staged (i.e., stage-streaming) and whether or not the displayed segments are deleted (i.e., trail-deletion). We show that stage-streaming and trail-deletion can achieve substantially lower bandwidth and storage requirements. In order to further increase the streaming and storage scalability, a distributed storage system can be used where multiple local servers are put close to user pools and get their files from one of the libraries through a network. We extend the models developed to such a system and specify the resource requirements to meet a given delay goal.

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Index Terms:
Hierarchical storage systems, video services, tertiary and secondary levels, distributed storage systems, staging and replacement policies, user delay goal.
Citation:
S.-H. Gary Chan, Fouad A. Tobagi, "Modeling and Dimensioning Hierarchical Storage Systems for Low-Delay Video Services," IEEE Transactions on Computers, vol. 52, no. 7, pp. 907-919, July 2003, doi:10.1109/TC.2003.1214339
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