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PRE-BUD: Prefetching for Energy-Efficient Parallel I/O Systems With Buffer Disks

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Executive Summary

A critical problem with parallel I/O systems is the fact that disks consume a significant amount of energy. To design economically attractive and environmentally friendly parallel I/O systems, the authors propose an energy-aware PREfetching strategy (PRE-BUD) for parallel I/O systems with disk buffers. They introduce a new architecture that provides significant energy savings for parallel I/O systems using buffer disks while maintaining high performance. There are two buffer disk configurations: adding an extra buffer disk to accommodate prefetched data, and utilizing an existing disk as the buffer disk. PRE-BUD is not only able to reduce the number of power-state transitions, but also to increase the length and number of standby periods.

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