I was playing around with btrfs. in an external USB case with 2 HD I create a RAID10:
29# btrfs fi show
Label: 'btest' uuid: c3aea6b7-afd5-4e0d-8d36-ef2cd4fb6d3a
Total devices 2 FS bytes used 1.75GiB
devid 1 size 3.64TiB used 4.01GiB path /dev/sdg1
devid 2 size 3.64TiB used 4.01GiB path /dev/sdh1
When I open thunar it shows me “btest” under the “Devices” section in the left panel. When I click on “btest” thunar is creating a new device “btest1”. When I click on “btest” again it creates a new device “btest2” and so forth. In my test I ended up with btest1 up to btest29 before I stopped.
They all show as regular mountpoints:
31# mount | grep btest
/dev/sdg1 on /mnt/btest type btrfs (rw,noatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /mnt/btest-subvol1-1 type btrfs (rw,noatime,compress=zstd:3,space_cache,subvolid=260,subvol=/subvol1/subvol1-1)
/dev/sdg1 on /run/media/matthias/btest type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest1 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest2 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest3 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest4 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest5 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest6 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest7 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest8 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest9 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest10 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest11 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest12 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest13 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest14 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest15 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest16 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest17 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest18 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest19 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest20 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest21 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest22 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest23 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest24 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest25 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest26 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest27 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest28 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
/dev/sdg1 on /run/media/matthias/btest29 type btrfs (rw,nosuid,nodev,relatime,compress=zstd:3,space_cache,subvolid=5,subvol=/)
What is wrong here? Any idea?