Adding disk

Hello guys,

I need to add disk to create RAID1, I see in BRTFS documentation de following steps:

mount /dev/sdb1 /mnt
btrfs device add /dev/sdc1 /mnt
btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt

But is it exactly in /mnt where I need to mount it? Or where is exactly mounted my actual disk? So that I can correct those commands.

Kind regards

Ok, it seems I got it. Lets see how the balance process goes