基于闪存的星载存储数据管理研究

Data management of satellite-borne storage based on Flash

由于闪存介质在航空航天数据存储中的优势,逐渐成为DRAM、SDRAM之后的下一代卫星存储解决方案。但由于闪存的存储特性,目前缺乏对数据存储的有效管理,星载闪存文件系统面临诸多有待研究的问题。通过分析星载环境下卫星存储特征,给出星载环境下的数据管理需求。实验模拟发现在IOPS(每秒进行读写的次数)、元数据、吞吐量、随机寻址四种性能指标上,F2FS优于BTRFS、ex FAT、NILFS这三种闪存文件系统;结合具体测试,分析了闪存内部并行对于文件系统的影响,得到F2FS较适合对基于闪存的星载存储进行数据管理,并结合数据管理需求提出了适用于星载环境下的几点改进方案,为星载环境下闪存文件系统设计和实现提供了研究基础。

Due to advantages in aerospace data storage, flash memory has become the next generation of satellite storage solu- tions after DRAM, SDRAM. Because of the storage characteristics of flash memory, it leads to noneffective management of da- ta storage. Therefore, the on-board flash file system is facing a lot of problems to be studied. By analyzing the characteristics of the satellite storage, this paper provided the data management requirements in the satellite-borne environment. It analyzed the IOPS（ input/output operations per second）, metadata, throughput, and random addressing of flash file systems using simu- lation experiments. It demonstrates that F2FS is superior to BTRFS, exFAT, NILFS. Based on the specific tests, this paper analyzed the impact of the flash internal parallelism on the file system. The result shows that F2FS is better suited for data management on flash-based on-board storage. It also put forward improvement suggestions for data storage in satellite-borne en- vironment. It provides a foundation for the design and implementation of flash file system in the satellite-borne environment.