Found the workaround. The windows contig utility reveals the .wt file has 1.6m fragments which hits NTFS limit. Defrag it and DB server now back to normal. Does MongoDB always map a large collection to a single OS file?
Found the workaround. The windows contig utility reveals the .wt file has 1.6m fragments which hits NTFS limit. Defrag it and DB server now back to normal. Does MongoDB always map a large collection to a single OS file?