Optimizing fragmentation and segment cleaning for CPS based storage devices

To manage the storage device of Cyber-physical systems (CPS), flash friendly file system (F2FS) has been a good choice for its good performance. F2FS is designed with consideration on the characteristics of flash storage as the key factor. Therefore, it has been highly suggested for the management of flash storage devices. However, several drawbacks of F2FS have been identified as the research work goes on, such as bad sequential read performance and segment cleaning induced performance impact. In order to solve these drawbacks, a set of empirical and comprehensive studies are performed on F2FS. Based on the studies, two novel schemes are proposed, including a multi-level threshold synchronous write scheme and a high detection frequency background segment cleaning scheme. Experimental results show that the proposed technologies present encourage improvement.