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ICDCS
2009
IEEE

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

9 years 9 months ago
Reducing Disk I/O Performance Sensitivity for Large Numbers of Sequential Streams
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 work we examine this tradeoff and provide an understanding of issues along with a practical solution. We use Disksim, a detailed architectural simulator, to examine several aspects of a modern I/O subsystem and we show the effect of various disk parameters on system performance under multiple sequential streams. Then, we propose a solution that dynamically adjusts I/O request streams, based on host and I/O subsystem parameters. We implement our approach in a real system and per...
George Panagiotakis, Michail Flouris, Angelos Bila
Added 08 Mar 2010
Updated 08 Mar 2010
Type Conference
Year 2009
Where ICDCS
Authors George Panagiotakis, Michail Flouris, Angelos Bilas
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