How to defrag XFS file-system if xfs_fsr exits with "no improvement will be made"?

I am trying to defrag a heavily fragmented XFS file-system on a CentOS 6.6 machine: [root@server opt]# xfs_db -c frag -r /dev/md3 actual 598, ideal 215, fragmentation factor 64.05% However, when I attempt to launch the xfs_fsr utility, it exits with the message No improvement will be made (skipping): [root@server opt]# xfs_fsr -t 25200 /dev/md3 -v /opt start inode=0 ino=536871105 No improvement will be made (skipping): ino=536871105 How can I get this to defrag?