Larry Jordan has a good article on how Disk Utility has been emasulated in OS X El Capitan
Larry Jordan has a good in depth article on the emasculation of Disk Utility in OS X El Capitan. He goes into how Soft Raid is the best solution to create software Raids in El Capitan.
Of course Soft Raid has always been a better solution than Disk Utility, but it is also a $179 solution to something that you used to be able to do for Free in Disk Utility!