I've read the Ceph OS recommendations document, but still I have a question. Which file system is better for Ceph?
XFS, ext4, or something else?
Ceph's recommendation for the choice of filesystem is between
ext4 is not recommended.
From that page:
We currently recommend XFS for production deployments. We recommend btrfs for testing, development, and any non-critical deployments. We believe that btrfs has the correct feature set and roadmap to serve Ceph in the long-term, but XFS and ext4 provide the necessary stability for today’s deployments. btrfs development is proceeding rapidly: users should be comfortable installing the latest released upstream kernels and be able to track development activity for critical bug fixes.
I would say that the forward-looking choice is