I am trying to upgrade a cluster from 3.5 -> 3.6 -> 4.0. The engine is currently on the 3.6 release but I seem unable to upgrade the ovirt-nodes (thin hypervisors) to 3.6.

When trying a fresh install (clean bare metal server) using the ovirt-node-ng-installer-ovirt-3.6-201606052403.iso the install fails at the end with the following error:

This is when having the installer choose the partition schema. However when I try to install using a manual partition schema based on the schema recommendation it still fails. 

The 4.x installer works fine, but I don't think I can use this since I will have to upgrade to the cluster to 3.6 with el7 hosts firsts?

Any workarounds that I can try to get 3.6 installed?

Thanks