I did check the code and there is no need to perform such sanity check since they are all done way before invoking mdadm.
Fabio ** Changed in: mdcfg (Ubuntu) Status: Unconfirmed => Rejected -- mdcfg hides errors from mdadm, and appears to succeed https://launchpad.net/bugs/13008 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs