btrfs fi us /mnt/video/
Overall:
    Device size:                   6.27TiB
    Device allocated:              6.27TiB
    Device unallocated:              0.00B
    Device missing:                  0.00B
    Used:                          5.85TiB
    Free (estimated):            141.68MiB      (min: 141.68MiB)
    Data ratio:                       1.00
    Metadata ratio:                   1.00
    Global reserve:              512.00MiB      (used: 0.00B)

Data,single: Size:4.98TiB, Used:4.98TiB
   /dev/xen-lvm/video      4.98TiB

Metadata,single: Size:1.29TiB, Used:882.81GiB
   /dev/xen-lvm/video      1.29TiB

System,single: Size:32.00MiB, Used:472.00KiB
   /dev/xen-lvm/video     32.00MiB

Unallocated:
   /dev/xen-lvm/video        0.00B



btrfs de st  /mnt/video/
[/dev/mapper/xen--lvm-video].write_io_errs    0
[/dev/mapper/xen--lvm-video].read_io_errs     0
[/dev/mapper/xen--lvm-video].flush_io_errs    0
[/dev/mapper/xen--lvm-video].corruption_errs  0
[/dev/mapper/xen--lvm-video].generation_errs  0


4.19.118-0-vanilla #1-Alpine SMP Thu Apr 23 11:16:44 UTC 2020 x86_64 Linux