Using RHEV3 Hypervisors: "RHEV3 Migration failed due to Error: Migration destination has an invalid hostname"

I am attempting to carry out a vm Migration from one host to another.

I am having a similar problem as described here: https://access.redhat.com/knowledge/ja/node/68634, however I am using RHEV3 hypervisors, which uses a read-only filesystem (and rightly so I might add).

The hosts have been configured using Admin configurator on setup from a usb device, and both hosts appear in the browser admin page with fqdn and IPs displayed correctly. As far as I understand it this error does not make sense. 

Does someone know something I don't? Any advise appreciated.