CoolCold wrote:

debian's update-initramfs includes /etc/mdadm/mdadm.conf automatically
on image (re)build
  

Thanks, wasn't sure if that was the case, thought I'd mention it for 
completeness.

-- 
Bill Davidsen [off-list ref]
  Even purely technical things can appear to be magic, if the documentation is
obscure enough. For example, PulseAudio is configured by dancing naked around a
fire at midnight, shaking a rattle with one hand and a LISP manual with the
other, while reciting the GNU manifesto in hexadecimal. The documentation fails
to note that you must circle the fire counter-clockwise in the southern
hemisphere.