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$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb        429G  294G  2.9G 100% /mnt/disaster

$ btrfs filesystem df /mnt/disaster
Data, RAID0: total=296.05GiB, used=293.23GiB
Data, single: total=8.00MiB, used=0.00
System, RAID1: total=8.00MiB, used=48.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, RAID1: total=1.00GiB, used=363.31MiB
Metadata, single: total=8.00MiB, used=0.00
unknown, single: total=128.00MiB, used=0.00