I am rather sleep deprived, so I may have misread things, but this doesn't seem to me to be the best benchmark to evaluate Ceph for database work.

From what I understand best practice in ceph for databases is to make a rbd image and format that with your filesystem of choice. I believe. The rbd stripe size should be tuned to you database writes in mind.

I believe ceph rbd supports rdma, but I cannot find much current details about it.