Hi, for oVirt 4.0 we're going to drop backward compatibility with oVirt < 3.6, you're kindly invited to cleanup the code dropping legacy support for older version. More in detail, for 4.0 we'll assume: * Support for EL6 hosts will be dropped * oVirt Engine support for EL6 will be dropped * Upgrade / Migration (if oVirt Engine was running on EL6) will be supported only from oVirt 3.6 * Network API support for oVirt < 3.6 will be dropped, the remaining API should be backward compatible * oVirt Engine will support cluster compatibility >= 3.6 * We won't support in place upgrade for oVirt Engine from 3.6 EL6 to 4.0 EL7: we'll support only migration. * oVirt DWH will only have 3.6 \ 4.0 compatibility views in 4.0. Thanks, -- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com