基于OpenSSD的闪存转换算法优化

Improved Flash Translation Layer Algorithm Based on OpenSSD

随着信息技术的快速发展,数据存储的需求日益增长,人们对硬盘读写性能的要求越来越高.相比于机械硬盘,固态硬盘可靠性高、能耗低,无寻道时间开销,逐渐取代机械硬盘成为主流的存储介质.但固态硬盘访问数据时需要经过转换,对应的闪存转换算法对读写性能影响很大.OpenSSD项目提供了一个可开发SSD固件的平台,基于此平台本文针对其上的闪存转换算法进行研究并优化,分析了影响I/O读写性能的各类因素,设计出一种适合CosmosOpenSSD的缓存管理和闪存管理方法,大幅提高了Cosmos Open SSD的性能.

With the rapid development of information technology, the need for data storage is growing, and the requirements for I/O performance are getting higher and higher. Compared with the traditional Hard Disk Drive（HDD）,Solid-State Disk（SSD） has more advantages such as high availability, low energy consumption, no seek time, etc. Due to these reasons, SSD gradually replaces HDD to become mainstream storage media. The Open SSD project is an initiative to promote research and education on the recent SSD technology by providing easy access to Open SSD platform on which open source SSD firmware can be developed. In this study, we investigated the Flash Translation Layer（FTL） algorithm on the Cosmos Open SSD platform, analyzed all kinds of factors that affect the I/O performance, designed a way to carry out the buffer management and flash management, and finally improved the I/O performance effectively.