Naptastic

  mdadm -D /dev/mdX
      # take note of the UUID and component devices
  mdadm --stop /dev/mdX
  
  # update mdadm.conf
  # here's some of what's on carbon right now as an example
  # Remember to update-initramfs -u after
  
  ARRAY /dev/md/quirk metadata=1.2 UUID=f87cc8e5:cd12521c:98d19111:96cb9fdb
  ARRAY /dev/md/green metadata=1.2 UUID=2dd272f2:600fed9f:87fb9d5f:483809fa
  
  mdadm --assemble --update=name $name @component_devices