标题：FC: Built-in flash-cache with fast cleaning for SMR storage
作者：Ma, Chenlin ;Shen, Zhaoyan ;Han, Lei ;Shao, Zili
作者机构：[Ma, Chenlin ;Han, Lei ] Department of Computing, Hong Kong Polytechnic University, Hong Kong;[Shao, Zili ] Department of Computer Science and Enginee 更多
会议名称：2019 IEEE International Conference on Embedded Software and Systems, ICESS 2019
会议日期：June 2, 2019 - June 3, 2019
来源：2019 IEEE International Conference on Embedded Software and Systems, ICESS 2019
摘要：Shingled Magnetic Recording (SMR) Disks are adopted as a high-density, non-volatile media which significantly precedes conventional disks in both the storing volume and cost. However, time-consuming read-modify-writes (RMWs) significantly degrade the system performance of SMR disks. Current designs devote a portion of disk spaces as a cache to alleviate the negative effect brought by RMWs, however, when the cache is full, the cleaning process becomes the performance bottleneck of the system. This paper presents a hybrid architecture called Flash-cache (FC) to manage the SMR disks by replacing the cache with built-in NAND flash. The performance without triggering a cleaning process of FC can be comparable to that of NAND flash rather than HDDs. Furthermore, FC is capable of shrinking down the large-scale cleaning process and performing much faster cleaning. Our experimental results show that FC can shorten the overall system average response time by over 73% and improve the cleaning efficiency by approximately 11.1 times.
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