企业级固态硬盘最新进展及测试技术研究

Research on the Latest Development and Test Technology of Enterprise Solid State Drive

企业级SSD (固态硬盘)的垃圾回收机制可能引发性能抖动,从而导致业务系统延迟甚至出错;目前,衡量固态硬盘的性能稳定性主要依赖于定性评价,尚未形成合理的定量评价指标;针对这一问题,研究了企业级SSD在生产工艺、闪存转换层及接口和协议等方面的最新进展;在总结现有SSD评价指标的基础上,采用变异系数作为性能稳定性的衡量指标,以FIO、Nmon和Memtester等为测试工具,提炼数据模型和QoS条件(服务质量),构建性能稳定性测试方案;该测试方案包括清空SSD、预热、压力测试以及数据读取等环节;实验结果表明,该方案可以科学合理地对SSD的性能稳定性进行定量评价;通过该方案,可以从规划设计环节开始对IT系统进行稳定性评估,保障核心业务系统的部署运营。

The garbage collection mechanism of enterprise solid-state drives may cause performance jitter,which may lead to business system delay or even error.At present,the measurement of SSD performance stability mainly depends on qualitative evaluation,owing to the lack of reasonable quantitative evaluation index.Aiming at this problem,the latest development of enterprise SSD in production technology,flash conversion layer,interface and protocol is studied.On the basis of summarizing the existing evaluation indexes of SSD performance stability,the coefficient of variation is used as the measurement index of performance stability.To build performance stability test scheme,FIO,Nmon and Memtester are used as test tools,when data model and QoS(Quality of Service)conditions are extract.The test scheme includes the steps of emptying SSD,preheating,pressure test and data reading.The experimental results show that the scheme can evaluate the performance stability of SSD scientifically and reasonably.Through this scheme,IT system stability can be evaluated from the planning and design stage,which is helpful for ensuring the deployment and operation of core business system.