ISSN 1000-1239 CN 11-1777/TP

计算机研究与发展 ›› 2018, Vol. 55 ›› Issue (9): 2016-2028.doi: 10.7544/issn1000-1239.2018.20180264

所属专题: 2018新型存储系统结构前沿技术专题

• 综述 • 上一篇    下一篇

高密度磁记录技术研究综述

王国华1,2,杜宏章2,吴凤刚2,刘石勇2,3   

  1. 1(华南理工大学软件学院 广州 510006); 2(美国明尼苏达大学计算机科学与工程系 明尼苏达州明尼阿波利斯 55455); 3(中国海洋大学信息科学与工程学院 山东青岛 266100) (ghwang@scut.edu.cn)
  • 出版日期: 2018-09-01
  • 基金资助: 
    国家留学基金委青年骨干教师出国研修项目(201706155079) This work was supported by the Young Scholars Study Abroad Program of China Scholarship Council (201706155079).

Survey on High Density Magnetic Recording Technology

Wang Guohua1,2, David Hung-Chang Du2, Wu Fenggang2, Liu Shiyong2,3   

  1. 1(School of Software Engineering, South China University of Technology, Guangzhou 510006); 2(Department of Computer Science and Engineering, University of Minnesota, Minneapolis, Minnesota 55455); 3(College of Information Science and Engineering, Ocean University of China, Qingdao, Shandong 266100)
  • Online: 2018-09-01

摘要: 大数据时代对大容量磁盘的需求日益增长,而在对现有的磁盘不进行较大改动的前提下,叠瓦式磁记录技术SMR是提高磁盘存储容量的最佳选择.近年来,兴起了一种新的磁记录技术——交错式磁记录技术IMR,它可以获得比SMR更高的存储密度和随机写性能.首先介绍了SMR磁盘的内部叠瓦式结构以及由此带来的数据写放大问题,并对缓解数据写放大问题的数据管理方式、性能特性评测以及基于SMR的上层应用系统方面的研究进展进行了概述;然后对新兴的IMR磁盘内部结构及其数据写放大问题进行了介绍,并对其将来的研究方向做了一定的分析和展望;最后对SMR磁盘和IMR磁盘在存储密度、数据写性能等方面进行了比较分析.当前有很多基于SMR磁盘的上层应用系统,这表明SMR磁盘可以高效地替代传统磁盘来构建大型的存储系统,而IMR磁盘的优势也将使其未来的发展前景可期.

关键词: 高密度磁记录技术, 叠瓦式磁记录, 交错式磁记录, 存储密度, 写放大

Abstract: In the era of big data, the demand for large-capacity disks has been growing. With minimal technology changes to the existing disk head and storage media of hard disks, the shingled magnetic recording (SMR) technology is the best choice to increase the disk storage capacity. The interlaced magnetic recording (IMR) technology is a newly developed technology in recent years, which can achieve higher storage density and random write performance than SMR. In this paper, we first introduce the shingled track layout of SMR drive and the resulting write amplification problem. We also review the data management methods that mitigate write amplification problem, the evaluation of performance characterizations, and the research on SMR-based upper applications. Then we introduce the interlaced track layout of IMR drive and its data write amplification problem. We also analyze the future research topics of IMR drive. Finally, we compare SMR drive and IMR drive from the storage density, random write performance, and other aspects. A variety of SMR-based upper applications, like file system, database, and RAID, prove that SMR drive can be effectively used to replace conventional disks to build large-scale storage systems. The advantages of IMR drive over SMR drive will make it have a bright future.

Key words: high density magnetic recording, shingled magnetic recording (SMR), interlaced magnetic recording (IMR), storage density, write amplification

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