工况和电压对商用固态硬盘性能特性影响研究

Research on Influence of Different Working Conditions and Voltage on Commercial SSD Performance Characteristics

商业现货(COTS)固态硬盘(SSD)凭借高性能、低成本的优点,在空间科学、空间应用领域应用十分广泛,但其是否具备在轨应用的能力,可靠性水平是否达到要求,还需要通过相关保证标准和规范进行评估验证。固态硬盘在正常运行中,由于读写比例、数据包大小、访问模式等工况变化和供电电压波动,导致其读/写速度、SATA接口电流等性能特性发生变化。本文针对这种现象,利用搭建的固态硬盘测试系统和基于开源Iometer二次开发的SSDTS测试软件,研究了某商用固态硬盘的性能变化规律。实验结果表明,固态硬盘接口电流受读写比例、数据包大小和供电电压影响较大,而读写速度受读写比例和数据包大小等工况影响较大。因此,空间应用固态硬盘选型工作需要结合实际任务模式和使用需求,同时使用过程中应保证输入电压的稳定性。本文为低等级固态硬盘在长期空间应用场合的可靠性研究提供了参考依据。

COTS SSDs are widely used in space science and space application area because of its superior performance and low cost.However,whether they are capable of operating properly on orbit and can meet demands of reliability are still need to be evaluated and demonstrated by relevant assurance standards and specifications.The SSD’s performance characteristics including read/write speed and SATA interface current and so on may get changed under working conditions of read/write proportion,packet size,and read/write mode and power supply.Considering this phenomenon,we researched the performance changing rules of a kind of commercial SSD by SSD testing apparatus and a newly developed SSDTS software based on open source software Iometer.The experimental results show that the interface current is significantly influenced by read/write proportion,packet size and voltage,and read/write speed are mainly affected by the working conditions such as read/write proportion,and packet size.Therefore,the SSD selection for space utilization should be based on practical mission mode and requirements,and the voltage stability should be confirmed,too.This paper provides a solid reference for the feasibility research on low-grade SSDs in space application.