[Nux]

Ceph has a yum repo for Centos, although Cephfs still does not work (maybe it will be backported to the "ancient" EL6 kernel someday). You can use the fuse client instead.

Configuration-wise, Ceph involves quite a bit of voodoo compared to Glusterfs, it's an area where I hope to see some improvement.

[tssva]

Is the metadata server still a single point of failure?

[laymil]

The metadata server has never been a single point of failure in Ceph.