Just thought I would drop a note here. My Netgear R7000 router had a firmware update the past week and now supports USB connected XFS formatted disks instead of ext3 and flaky ext4 drives. I tried a number of different Windows and Linux partitioning utilities but none would make a drive recognized by the Netgear (it is annoyingly picky at recognizing drives). So I gave it a last try and connected the USB hard drives up to my little OMV server and created the XFS formatted drives there. Dismounted them and voila! My Netgear now is happily serving out a network drive formatted with XFS.