Hi,
Someone from the Hypervisor & Kernel team will have a look shortly, we'll get back to you with our findings.
Thanks a lot for the very detailed report!
Yann
Different use cases: Ceph is better with more hosts (at least 6 or 7 minimum) while XOSTOR is better between 3 to 7/8.
We might have better Ceph support in the future for large clusters.