Quoting Andrew Greig ([email protected]):

> Thanks Rick,
> I travelled so long without problems that technology has oustripped my
> understanding.  It is 18 years on Linux for me and around 17.5 since you
> informed me (graciously) about the bad habit of cross posting. So nice to
> hear from you.

Delighted to hear from you, too, Andrew.  

I should have added that, at least on all Linux system implementations
I've seen for the past couple of decades, the mdadm.conf file ends up
being slightly redundant during normal operation, because array
construction stores all required RAID metadata for the RAID array in the
RAID superblock stored on each physical device in the array.  ISTR that 
mdadm.conf can be fully reconsructed from that stored metadata, even.

That's talked about briefly, here:
https://raid.wiki.kernel.org/index.php/RAID_setup#The_Persistent_Superblock_.282011.29

The larger point I'm making is that md RAID has become, over a long
period of time, pretty bulletproof, speaking in general terms.  (Of
course, nothing is entirely safe from an absent-minded sysadmin.  ;->  )
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