> Sent: Saturday, January 11, 2025 at 9:51 AM
> From: "Roger Price" <deb...@rogerprice.org>
> To: "debian-user Mailing List" <debian-user@lists.debian.org>
> Subject: Re: Removing an unwanted RAID 1 array
>
> On Sat, 11 Jan 2025, Greg Wooledge wrote:
>
> > On Sat, Jan 11, 2025 at 13:10:51 +0100, Roger Price wrote:
> > > On Sat, 11 Jan 2025, Michel Verdier wrote:
> > >
> > > > If I remember well you have to first set the device as faulty with
> > > > --fail
> > > > before --remove could be accepted.
> > >
> > > No luck :
> > >
> > > root@titan ~ mdadm --fail /dev/md4 --remove /dev/sdb7
> > > mdadm: hot remove failed for /dev/sdb7: Device or resource busy
> >
> > Is it mounted? Is it being used as swap?
>
> No it's not mounted - I ran umount /dev/md4. It's not being used as swap.
>
> rprice@titan ~ lsblk
> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
> ...
> └─sdb7 8:23 0 20G 0 part
> └─md124 9:124 0 20G 0 raid1
findmnt
>
> I tried commenting out the entry for md4 in /etc/mdadm/mdadm.conf . I then ran
> update-initramfs -u as instructed in the mdadm.conf file.
> I then rebooted, but md4 reappeared as /dev/md124.
>
Then is probaly systemd
Do you have the array in /etc/fstab?
