一种闪存敏感的多级缓存管理方法

发布时间：2019-01-30 17:37

【摘要】：基于闪存的固态硬盘(solid state driver,简称SSD)已经广泛应用于各种移动设备、PC机和服务器.与磁盘相比,尽管SSD具有数据存取速度高、抗震、低功耗等优良特性,但SSD自身也存在读写不对称、价格昂贵等不利因素,这使得SSD短期内不会完全取代磁盘.将SSD和磁盘组合构建混合系统,可以发挥不同的硬件特性,提升系统性能.基于MLC型SSD和SLC型SSD之间的特性差异,提出了一种闪存敏感的多级缓存管理策略——FAMC.FAMC将SSD用在内存和磁盘之间作扩展缓存,针对数据库系统、文件管理中数据访问的特点,有选择地将内存牺牲页缓存到不同类型的SSD.FAMC同时考虑写请求模式和负载类型对系统性能的影响,设计实现对SSD友好的数据管理策略.此外,FAMC基于不同的数据置换代价提出了适用于SSD的缓冲区管理算法.基于多级缓存存储系统对FAMC的性能进行了评测,实验结果表明,FAMC可以大幅度降低系统响应时间,减少磁盘I/O.
[Abstract]:Flash-based solid-state hard disk (solid state driver,) has been widely used in various mobile devices, PC machines and servers. Compared with the disk, although SSD has the advantages of high data access speed, seismic resistance, low power consumption and so on, the SSD itself also has some disadvantages, such as asymmetric reading and writing, expensive price, etc., which makes SSD not completely replace the disk in the short term. Combining SSD and disk to build a hybrid system can play different hardware characteristics and improve system performance. Based on the characteristic difference between MLC type SSD and SLC type SSD, this paper proposes a multi-level buffer management strategy sensitive to flash memory: FAMC.FAMC uses SSD between memory and disk for extended cache, aiming at database system. The characteristics of data access in file management include selectively caching sacrificial pages to different types of SSD.FAMC and considering the impact of write request mode and load type on system performance. A data management strategy that is friendly to SSD is designed and implemented. In addition, FAMC proposes a buffer management algorithm for SSD based on different data replacement costs. The performance of FAMC is evaluated based on multilevel cache storage system. Experimental results show that FAMC can greatly reduce system response time and disk I / O.
【作者单位】：中国人民大学信息学院;淮阴师范学院计算机科学与技术学院;
【基金】：国家自然科学基金(61379050,91224008) 国家高技术研究发展计划(863)(2013AA013204) 教育部高等学校博士学科点专项科研基金(20130004130001)
【分类号】：TP333;TP315

【共引文献】