+
+ NB: in Ganeti 2.8, the ``cmdlib.py`` file was split into a series of files
+ contained in the ``cmdlib`` directory. If Ganeti is installed from sources
+ and not from a package, while downgrading Ganeti to a pre-2.8
+ version it is important to remember to remove the ``cmdlib`` directory
+ from the directory containing the Ganeti python files (which usually is
+ ``${PREFIX}/lib/python${VERSION}/dist-packages/ganeti``).
+ A simpler upgrade/downgrade procedure will be made available in future
+ versions of Ganeti.
+