Re: Further question(s)

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On 05/01/2018 10:34 AM, Wols Lists wrote:
> Shouldn't make any difference.

This.

> /dev/md0 is the old-style numbered array.
> 
> /dev/md/0 is the new-style named array.
> 
> (And the link between numbering and default names is obvious :-)
> 
> I just find it slightly odd that it isn't /dev/md127 - the default
> numbering now counts down from 0xff.

0xff is 255, not 127.  The counting down from 127 is a fallback when an
actual name or number is not available from mdadm.conf.  Have /dev/md127
or /dev/md/127 present in one's system means nobody bothered to
deliberately configure the array number/name.

Personally, I always deliberately number my arrays, and I use the old
style.  And I turn off auto-assembly, so the fallback is never invoked.

> Bear in mind I don't have an mdadm.conf, a couple of ideas to play with
> are (1) what happens if you boot without an mdadm.conf? (2) what do you
> get if you regenerate your mdadm.conf (especially if you boot without one)?
> 
> I'm guessing your current mdadm.conf is affecting things, and seeing as
> I've never needed one, I can't really advise ...

You just think you don't need one.  You just haven't needed one /yet/.

I highly recommend creating an mdadm.conf file with explicit assembly
instructions (but with name and UUID only, though).

Phil
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