MGTCA-01203
The name supplied to -oldClusterName '{0}' is the same as the current cluster name.
Cause
An attempt to execute 'mgmtca' to update the cluster name property of the Grid Infrastructure Management Repository failed because the indicated name specified as the 'old cluster name' was the same as the current cluster name. Either the cluster rename was not complete or the wrong name was specified.
Action
Verify the cluster name has indeed changed and retry the operation indicating the correct old cluster name.