I think this was what I tried to use for one of those shared file system setups for a web app where we needed shared files.

And the daemon responsible for this would end up hard-locking the VPS it was running on.

Oh yeah, here's the issue I found that mirrored my experience: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751933

That was a rough experience since it would run fine until it hit a certain level of load.