[CentOS] mdadm --stop

I have been trying to delete an md.  I have recently updated to
version 1.12 of mdadm.
I used to be able to do mdadm ,dev. --stop.  It does not seem to be
stopping, but I do not get any error and the $?/return code is 0.

The --verbose option for mdadm does nothing for --stop.  How do I
determine why this is not successful?


Thanks...Art