[baruch]

It's easier to write the system's front end while paying little attention to the backend and "just" letting a local filesystem do a lot of the work for you, but it doesn't work well. The interesting question is if the result is also that the frontend-to-backend communication abstraction is good enough to replace the backend with a better solution. I'm not familiar enough with Ceph and BlueStore to have a conclusion on that.

I happen to work for a distributed file-system company, and while I don't do the filesystem part itself, the old saying "it takes software 10 years to mature" is so true in this domain.