I've been trying to find performance evaluations of distributed file systems, and in most tests I've seen Ceph is a lot slower than alternatives like GlusterFS.

I've been trying to find performance evaluations of distributed file systems, and in most tests I've seen Ceph is a lot slower than alternatives like GlusterFS. When you say Ceph is "state of the art in software defined storage", are you including performance, or are there advantages in features or reliability where you think it outclasses the competition?