It will probably work for 7 -> 8, the upgrade tool is a recent addition. It already worked in RHEL for 6 -> 7. That being said, for RHEL 6 -> 7 I did a clean r

It will probably work for 7 -> 8, the upgrade tool is a recent addition. It already worked in RHEL for 6 -> 7. That being said, for RHEL 6 -> 7 I did a clean reinstall due to the large architectural changes and it was the right decision.