Every time I run ratterplatter[1], I really miss slow computers with a
  hard disk. And no GUI -- just DOS with one program running at a time.


                           ____________________


  I just read on the XFS mailing list[2] that "copy on write"  might  be
  available  in stable XFS, soon. I also realized that "CoW in XFS" does
  not mean that XFS will be the new btrfs. It "only" means that you  can
  perform  file copies using CoW, but the rest of the filesystem remains
  the traditional XFS. It's not like every file operation  will  be  CoW
  all of a sudden, like it is in ZFS.

  I  guess  that  I,  personally,  would  gain  very little from reflink
  copies.  What's much more interesting for me is snapshots. That  would
  be huge (yuge!).

  ____________________

  1. https://github.com/vain/ratterplatter

  2. https://www.spinics.net/lists/linux-xfs/msg09685.html