You need to show fstab.  Systemd owns raid and its entry is not working.  It will overrule you and unmount anything you put there since it thinks it owns it.  

On Sun, May 24, 2020, 12:36 PM Patrick O'Callaghan <pocallaghan@gmail.com> wrote:
On Sun, 2020-05-24 at 19:29 +0200, Alexander Dalloz wrote:
> > > Generally you partition the disks: sdd1 sde1, then create a RAID of of them: md127,
> > > then you format and mount md127.
>
>
> That's called partitioned RAID. Makes it easier if you need to replace
>
> an array member.
>
>
>
> > So clearly the other way around.
> > > You may have messed up something: maybe you have formatted both md127 and md127p1?
> > I don't think so, but I guess it's possible. What I can't understand is
> > why everything appeared to be working before I rebooted.

Just to repeat, in case it got lost in the thread, this is what shows
up in the journal:

May 24 18:12:31 Bree kernel: EXT4-fs (md127p1): mounted filesystem with ordered data mode. Opts: (null)
May 24 18:12:31 Bree systemd[1]: raid.mount: Unit is bound to inactive unit dev-md0p1.device. Stopping, too.
May 24 18:12:31 Bree systemd[1]: Unmounting /raid...

The part I don't get is:

"Unit is bound to inactive unit dev-md0p1.device"

poc
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