I am just wondering which is better to work with HAMMER. I found 1) softraid with natacontrol ( http://www.dragonflybsd.org/docs/docs/howtos/howtosoftwareraid/) and
2) hammer volume-add (http://leaf.dragonflybsd.org/mailarchive/commits/2009-12/msg00068.html). Both links inaccessible at the time of this writing as the dragonfly server seems to be down. natcontrol-based softraid behaves like traditional raid whereas I am not aware of hammer volume-add (because the site is not available when these lines are written). Thanks!