Ubuntu had created a simple to use MDADM control center. It is integrated into an disk utility interface where the S.M.A.R.T status of your hard drives can be examined. For a block of raid hard drives the utility will give you the option to add, remove, fix, or repair individual drivers. This utility makes it extremely simple to replace broken drivers determined faulty by S.M.A.R.T. I was comfortable using the command line to use MDADM, but this utility makes its even easier.

The new drive utility is found in the administrator panel of Ubuntu Karmic Koala.

Gnome Disk Utility

Gnome Disk Utility