Emerging hardware devices (e.g., NVMe SSD, RISC-V, etc.) open new opportunities for improving the overall performance of computer systems. In addition, the applications try to fully utilize hardware resources to keep up with those improvements. However, these trends can cause significant file system overheads (i.e., fragmentation issues). In this paper, we first study the reason for the fragmentation issues on an F2FS file system and present a new tool, calledFragTracer, which helps to analyze the ratio of fragmentation in real-time. For user-friendly usage, we designedFragTracerwith three main modules, monitoring, pre-processing, and visualization, which automatically runs without any user intervention. We also optimizedFragTracerin terms of performance to hide its overhead in tracking and analyzing fragmentation issues on-the-fly. We evaluatedFragTracerwith three real-world databases on the F2FS file system, so as to study the fragmentation characteristics caused by databases, and we compared the overhead ofFragTracer. Our evaluation results clearly show that the overhead ofFragTraceris negligible when running on commodity computing environments.