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Description of problem: Currently the docs state: "3.2. Upgrading to Red Hat Virtualization Manager 4.0"" there is statement: "You may now upgrade the hosts, then change the cluster and data center compatibility version to 4.0." This is a misleading descirption. Fact is that the current RHEV-H 3.6 host needs to be manually reinstalled using the ISO (and _not_ through the Engine reinstall button).
Now published at: https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/paged/upgrade-guide/32-upgrading-to-red-hat-virtualization-manager-40 https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/paged/self-hosted-engine-guide/53-upgrading-a-rhel-based-self-hosted-engine-environment https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/paged/self-hosted-engine-guide/54-upgrading-a-rhev-h-based-self-hosted-engine-environment