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    Why do you want to use an md-type raid when you have ZFS? My suggestion would be to mirror both 750GiB drives, mirror both 400GiB drives create a stripe across them. Commented Jul 25, 2013 at 9:28
  • Marco's right: ZFS has no problem with the drive set you have. You just need to create two mirrors in the same pool. ZFS will cope with this just fine. Commented Jul 25, 2013 at 14:08
  • Sparse files can be used for testing. Commented Jul 25, 2013 at 18:13