R&D: Adaptive Write Interference Management With Efficient Mapping for Shingled Recording Disks

IEEE Xplore has published, in 2019 IEEE 37th International Conference on Computer Design (ICCD) proceedings, an article written by Ming-Chang Lee, Li-Pin Chang, Sung-Ming Wu, and Wei-Shang Yui, National Chiao Tung University, Taiwan.

Abstract: “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.“