FMCM: a efficient flash memory cache management scheme for energy-efficient disks

Authors:
YoungHwan Kim;TaeHyoung Kim;Yuri Kim;Ah-Reum Kim
Affiliations:
Soongsil University, Seoul, Korea;Soongsil University, Seoul, Korea;Soongsil University, Seoul, Korea;Soongsil University, Seoul, Korea
Venue:
Proceedings of the 2011 ACM Symposium on Applied Computing
Year:
2011

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Abstract

Recently, flash memory in serving as a cache layer for disks gains a lot of attention. However, the out-place update characteristic of flash memory leads to increase of garbage collection overhead and decrease of cache hit ratio. In this paper, we propose FMCM which is the management scheme for a circular cache according to consideration of characteristics of the flash memory, search into new data, block replacement and garbage collection mechanism. We evaluated FMCM using a trace-driven simulator. The proposed scheme can save the disk energy about 3~5% compared with a typical system using flash memory cache. FMCM also improve the average response time about 1.5~4ms faster than the existing system.