Start Threshold Migration only works on an 'Active' file system. If you want to make file-system file system 'Active', select 'Add Space Management'.
You tried to start Threshold Migration on a "Native" file system (a file system to which space management has not been added). You must add space management to the file system first.
Processing stopped.
Select OK to return. Select "Add" if you want to add space management to the file system.