Doug Ledford wrote:

If I recall correctly, this fixes the primary symptom, but not the whole
problem.  When in --monitor mode, mdadm will reopen each device every 15
seconds to scan its status.  As such, a shutdown could still fail if
mdadm is still running and the timing is right.  In that instance,
retrying the shutdown on failure would likely be enough to solve the
problem, but that sounds icky to me.  Would be much better if mdadm
could open a control device of some sort and query about running arrays
instead of opening the arrays themselves.

Wouldn't simply killing the "mdadm --monitor" process early on in the 
shutdown process achieve the same result?

R.
-- 
http://robinbowes.com