Issue No. 11 - Nov. (2017 vol. 66)
Fenggang Wu , Department of Computer Science and Engineering, University of Minnesota, Twin Cities, Minneapolis, MN
Ziqi Fan , Department of Computer Science and Engineering, University of Minnesota, Minneapolis, MN
Ming-Chang Yang , Graduate Institute of Networking and Multimedia, National Taiwan University, Taipei, Taiwan
Baoquan Zhang , Department of Computer Science and Engineering, University of Minnesota, Minneapolis, MN
Xiongzi Ge , Department of Computer Science and Engineering, University of Minnesota, Minneapolis, MN
David H.C. Du , Department of Computer Science and Engineering, University of Minnesota, Minneapolis, MN
Shingled Magnetic Recording (SMR) drives can benefit large-scale storage systems by reducing the Total Cost of Ownership (TCO) of dealing with explosive data growth. Among all existing SMR models, Host Aware SMR (HA-SMR) looks the most promising for its backward compatibility with legacy I/O stacks and its ability to use new SMR-specific APIs to support host I/O stack optimization. Building storage systems using HA-SMR drives calls for a deep understanding of the drive’s performance characteristics. To accomplish this, we conduct in-depth performance evaluations on HA-SMR drives with a special emphasis on the performance implications of the SMR-specific APIs and how these drives can be deployed in large storage systems. We discover both favorable and adverse effects of using HA-SMR drives under various workloads. We also investigate the drive’s performance under legacy production environments using real-world enterprise traces. Finally, we propose a novel host-controlled buffer that can help to reduce the severity of the decline in HA-SMR performance under our discovered unfavorable I/O access patterns. Without a detailed comprehensive design, we show the potential of the host-controlled buffer by a case study.
Media, Drives, Cleaning, Random access memory, Performance evaluation, Heat-assisted magnetic recording
F. Wu, Z. Fan, M. Yang, B. Zhang, X. Ge and D. H. Du, "Performance Evaluation of Host Aware Shingled Magnetic Recording (HA-SMR) Drives," in IEEE Transactions on Computers, vol. 66, no. 11, pp. 1932-1945, 2017.