Hallo,
I've made a 2-partitions system with
mkfs.btrfs -P Probe -m raid1 -d raid0 /dev/sdb1
mount LABEL=Probe /mnt/Probe
btrfs device add /dev/sdb2 /mnt/Probe
"btrfs-show" (and other tests) showed that all worked well.
btrfs device delete /dev/sdb2 /mnt/Probe
only showed "error" (I haven't noticed the long text, something like
"can't delete"); but "dmesg" showed the reason:
btrfs: unable to go below two devices on raid1
Could this message also shown in the "regular" error message?
Viele Gruesse!
Helmut
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