Oracle VM Release 3.x is not backwardly compatible with previous
Oracle VM releases. If you are using Oracle VM Release 2.x you cannot
upgrade to Release 3.1.1. You must reinstall your Oracle VM Servers and Oracle VM Manager. You can
however upgrade between Oracle VM 3.x releases, for example, upgrading from
Oracle VM Release 3.0.3 to 3.1.1. See the Oracle VM Installation and Upgrade Guide
for information on upgrading between Oracle VM 3.x
releases.