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Mass Storage Systems and Technologies, IEEE / NASA Goddard Conference on (2007)
San Diego, California, USA
Sept. 24, 2007 to Sept. 27, 2007
ISBN: 0-7695-3025-7
pp: 299-304
Timothy Bisson , University of California, Santa Cruz, USA
Scott A. Brandt , University of California, Santa Cruz, USA
One of the goals of upcoming hybrid hard disks is to reduce power consumption by adding a small amount of non-volatile flash memory (NVCache) to the drive itself. By using the NVCache to satisfy writes while the rotating media is spun-down, hard disk power consumption can be decreased by lengthening low-power periods. However, the NVCache must eventually be flushed back to the rotating media in order to cache additional data. In this paper we explore two questions: when and how should NVCache content be flushed to rotating media in order to minimize the overhead of data synchronization. We show that by using traditional I/O mechanisms such as merging and reordering, combined with a "flush only when full" policy, flushing performance improves significantly.

S. A. Brandt and T. Bisson, "Flushing Policies for NVCache Enabled Hard Disks," 2007 24th IEEE Conference on Mass Storage Systems and Technologies - MSST '07(MSST), San Diego, CA, 2007, pp. 299-304.
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