There were less than 2 free space extents on the volume. DEFRAG requires at least 2 free space extents to process. If MAXMOVE(n,p) has been specified, the system might issue this message for each pass that the DEFRAG function runs when the volume has less than two free space extents. The DEFRAG function continues to run until all of the specified passes have been completed because the number of free space extents might change because of the activity on the volume between the DEFRAG passes.