Reducing Disk I/O Performance Sensitivity for Large Numbers of Sequential Streams

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Executive Summary

Retrieving sequential rich media content from modern commodity disks is a challenging task. As disk capacity increases, there is a need to increase the number of streams that are allocated to each disk. However, when multiple streams are accessing a single disk, throughput is dramatically reduced because of disk head seek overhead, resulting in requirements for more disks. Thus, there is a tradeoff between how many streams should be allowed to access a disk and the total throughput that can be achieved. In this paper, the authors examine this tradeoff and provide an understanding of issues along with a practical solution.

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