On Sun, 2 Dec 2012 10:45:03 -0800 "Rich Braun" <richb at pioneer.ci.net> wrote: > convert the existing drive to 'dynamic' and set up the mirror. I > challenge the Linux distro vendors to make it that simple. It is possible with btrfs and a recent enough version of GRUB that knows how to boot from btrfs file systems. -- Rich P.