Browsing by Author "Yui, Wei-Shang"

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Adaptive Write Interference Management with Efficient Mapping for Shingled Recording Disks
(2019-01-01)
Lee, Ming-Chang
;
Chang, Li-Pin
;
Wu, Sung-Ming
;
Yui, Wei-Shang
;
資訊工程學系
Shingled Magnetic Recording (SMR) is a novel disk technology that partially overlaps adjacent disk tracks for high storage density. The partial overlap creates write interference between tracks, and overwriting a track requires to rewrite all its downstream tracks. Inspired by the highly unequal track modify probabilities under real workloads, we propose moving frequently modified tracks toward a downstream, deliberately reserved track, called a guard track, to reduce the extent of write interference. We also introduce a low-cost, seek-optimized scheme for efficient logical-to-physical address mapping. Experimental results showed that our approach outperformed a popular design by 54% and 55% on average in terms of write response time and total disk writes, respectively.