Previously upgrading from Red Hat Enterprise Virtualization Manager 3.0 to 3.1 was not formally supported. This update fixes a number of known issues with the upgrade process. As a result upgrading from Red Hat Enterprise Virtualization Manager 3.0 to 3.1 is now supported for the majority of installations.
* Upgrades of Red Hat Enterprise Virtualization 3.0 environments that contain V1 format block (iSCSI or FCP) storage domains that (1) are larger than 250 GB in size and (2) were created in Red Hat Enterprise Virtualization 2.2, are not supported. Changing the compatibility mode of a data center that contains such storage domains to 3.1 will result in a failure. A future update will correct this issue. Please note that V1 block storage domains created using the REST API in Red Hat Enterprise Virtualization 3.0 are unaffected. (BZ#893184)
For more information on upgrading to Red Hat Enterprise Virtualization Manager 3.1 consult the Installation Guide:
Additional tips and considerations to take into account are also available in the Red Hat Knowledge Base: