When the mount point for a btrfs pool resides on an existing
independent btrfs pool and the first btrfs pool is not mounted,
running 'btrfs fi df /unmounted/pool' will show the btrfs df
information of the underlying mounted btrfs pool. This is most likely
undesirable.
The btrfs wiki has the following:
What information to provide when asking a support question
When reporting errors or asking for support always supply the output
of the following commands:
uname -a
btrfs --version
btrfs fi show
btrfs fi df /home # Replace /home with the mount point of your
btrfs-filesystem <===
dmesg > dmesg.log
Real world example:
>From /etc/fstab - / {root level}
LABEL="PhoenixRootSSD" / btrfs autodefrag,compress=lzo,space_cache,noatime 0 0
>From /etc/fstab - /PublicA
LABEL="FSgyroA" /PublicA btrfs
autodefrag,compress=lzo,space_cache,noatime,noauto 0 0
# btrfs fi df /PublicA
Data, single: total=107.00GiB, used=84.26GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=3.01GiB, used=1.27GiB
GlobalReserve, single: total=448.00MiB, used=0.00B
# btrfs fi df /
Data, single: total=107.00GiB, used=84.26GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=3.01GiB, used=1.27GiB
GlobalReserve, single: total=448.00MiB, used=0.00B
# btrfs fi show
Label: 'PhoenixRootSSD' uuid: ed1790a7-87e6-466c-a68c-e375303fd99f
Total devices 1 FS bytes used 85.53GiB
devid 1 size 200.04GiB used 110.01GiB path /dev/sda5
Label: 'PhoenixRoot' uuid: 7ba4f981-c2ff-4a70-96a6-4c4b25f96e96
Total devices 1 FS bytes used 2.00TiB
devid 1 size 2.71TiB used 2.38TiB path /dev/sdg5
Label: none uuid: a7e2e4f6-e324-4cf4-8b76-33bb7dedf5d1
Total devices 1 FS bytes used 384.00KiB
devid 1 size 2.73TiB used 2.02GiB path /dev/sdab1
checksum verify failed on 120890386268160 found D7319043 wanted 33D22DF5
checksum verify failed on 120890386268160 found 50ECAB17 wanted 2D8EEBCA
checksum verify failed on 120890386268160 found D7319043 wanted 33D22DF5
bytenr mismatch, want=120890386268160, have=65536
Label: 'FSgyroA' uuid: 4dae41b0-a459-4c20-a09d-0aca9563b9ad
Total devices 20 FS bytes used 53.15TiB
devid 1 size 3.64TiB used 3.46TiB path /dev/sdb
devid 2 size 3.64TiB used 3.46TiB path /dev/sdd
devid 3 size 3.64TiB used 3.46TiB path /dev/sdc
devid 4 size 2.73TiB used 2.73TiB path /dev/sdh
devid 5 size 4.55TiB used 4.50TiB path /dev/sde
devid 6 size 4.55TiB used 4.50TiB path /dev/sdf
devid 7 size 4.55TiB used 4.49TiB path /dev/sdi
devid 8 size 4.55TiB used 4.50TiB path /dev/sdj
devid 9 size 5.46TiB used 5.19TiB path /dev/sdm
devid 10 size 5.46TiB used 5.19TiB path /dev/sdn
devid 11 size 5.46TiB used 5.19TiB path /dev/sds
devid 12 size 5.46TiB used 5.19TiB path /dev/sdu
devid 14 size 2.73TiB used 2.73TiB path /dev/sdag
devid 15 size 2.73TiB used 2.73TiB path /dev/sdz
devid 16 size 2.73TiB used 2.73TiB path /dev/sdy
devid 17 size 2.73TiB used 2.73TiB path /dev/sdac
devid 18 size 2.73TiB used 2.73TiB path /dev/sdaf
devid 19 size 2.73TiB used 2.73TiB path /dev/sdx
devid 20 size 2.73TiB used 2.73TiB path /dev/sdad
*** Some devices missing
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