On Tue, 2020-05-26 at 11:07 -0700, Samuel Sieb wrote:
> On 5/26/20 4:15 AM, Patrick O'Callaghan wrote:
> > On Mon, 2020-05-25 at 23:22 -0500, Gabriel Ramirez wrote:
> > > On 5/25/20 5:23 PM, Patrick O'Callaghan wrote:
> > > > Yes, I understand that. I still think the behaviour of mdadm in this
> > > > case is counter-intuitive. When I explicitly ask for the creation of an
> > > > array called /dev/md0 and the command first of all warns me that this
> > > > will (not "may") destroy the existing partition table and do I want to
> > > > proceed, then when I say yes apparently succeeds, I think I'm entitled
> > > > to think that /dev/md0 has been created, but it hasn't.
> > > 
> > > remember /dev is created at linux boot so the devices names are dynamic
> > > (/dev/mdN)
> > 
> > Yes, that's true. However I'm talking about immediately after doing the
> > array creation. If /dev/md0 is not a valid name because it will be
> > destroyed on reboot, shouldn't mdadm warn me?
> 
> I think there's a suggested number in the raid metadata, but it's not 
> necessarily used.  What would happen if you added two raid arrays with 
> the same number?
> 
> If you run "mdadm -E /dev/sdh1" where "sdh1" is a raid member, you can 
> see the metadata.  There's a line with "Name : hostname:0" and I think 
> the ":0" part is the md number.  But this raid array is actually at 
> md127.  I have another one with :126 which is at md126.
> 
> However, you shouldn't be using /dev/md* in your fstab anyway, you 
> should be using the filesystem UUID.

I'm doing that now in fact, and it seems to be stable.

poc
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