Same warning in v5.14.2. Output is mostly the same except that it
informs me it'd running a full device TRIM during mkfs.

>  If you want to use the fs, just do a btrfs balance with "start
-musage=0" should remove that SINGLE metadata chunk.

Earlier I ran
`btrfs balance start -mconvert=raid1,soft /mnt/tmp`
which seemed to have done the trick. Any notable difference between
the results of the two commands?

Sincerely,
A Fish on Fire


On Sat, Oct 9, 2021 at 7:19 AM Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
>
>
>
> On 2021/10/9 19:44, FireFish5000 wrote:
> > After creating a new btrfs raid1 and was surprised to be greeted with
> > the warning
> >
> > WARNING: Multiple block group profiles detected, see 'man btrfs(5)'.
> > WARNING:   Metadata: single, raid1
> >
> > I asked on the IRC, and darkling directed me to the mailing list
> > suspecting this was a regression.
> > I am on 5.14.8-gentoo-dist with btrfs-progs v5.14.1
> >
> > I have attached a script to reproduce this with temporary images/loop devices,
> > Along with the full output I received when running the script.
> >
> > A shortened version of the commands that I ran on my *real drives* and
> > the relevant output is also provided below for convenience. P at the
> > end of the device path was inserted incase sleepy joe copies it
> > thinking its the reproduction script:
> >
> > # mkfs.btrfs --force -R free-space-tree -L BtrfsRaid1Test -d raid1 -m
>
> This seems to be a recent bug in btrfs-progs which doesn't remove the
> temporary chunk.
>
> You can try the latest v5.14.2 to see if it's solved.
>
> If you want to use the fs, just do a btrfs balance with "start
> -musage=0" should remove that SINGLE metadata chunk.
>
> Thanks,
> Qu
> > raid1 /dev/sdaP /dev/sdbP; mount /dev/sda /mnt/tmp; btrfs filesystem
> > df /mnt/tmp
> > btrfs-progs v5.14.1
> > ....truncated....
> > ....truncated....
> > Data, RAID1: total=1.00GiB, used=0.00B
> > System, RAID1: total=8.00MiB, used=16.00KiB
> > Metadata, RAID1: total=1.00GiB, used=176.00KiB
> > Metadata, single: total=8.00MiB, used=0.00B
> > GlobalReserve, single: total=3.25MiB, used=0.00B
> > WARNING: Multiple block group profiles detected, see 'man btrfs(5)'.
> > WARNING:   Metadata: single, raid1
> >