Unattended upgrade from OES 2 or OES 11 to OES 11 SP1 has been enhanced and has undergone some changes. For more information, see OES 11 SP2: Installation Guide.
A single integrated ISO to install or upgrade OES 11 SP1 is now available. This ISO contains both SLES 11 SP2 and OES 11 SP1.
Channel upgrade support is added in OES 11 SP1. It supports upgrade from OES 11 to OES 11 SP1.