It's great that ext4 supports huge directories efficiently, but many other file systems don't. And accessing over NFS may bog down. So if you're writing portabl

It's great that ext4 supports huge directories efficiently, but many other file systems don't. And accessing over NFS may bog down. So if you're writing portable code, better to use a deep structure. More at https://stackoverflow.com/questions/5019371/storing-accessing-up-to-10-million-files-in-linux https://stackoverflow.com/questions/5019371/storing-accessin...