understanding btrfs fi df

[Hendrik Friedel <hendrik@friedels.name>]

Hello,

I am struggling to understand the output of btrfs fi df:

btrfs fi df /mnt/__Complete_Disk/
Data, RAID5: total=3.85TiB, used=3.85TiB
System, RAID5: total=32.00MiB, used=576.00KiB
Metadata, RAID5: total=6.46GiB, used=5.14GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

I have three disks:

btrfs fi show
Label: none  uuid: a8af3832-48c7-4568-861f-e80380dd7e0b
         Total devices 3 FS bytes used 3.85TiB
         devid    1 size 2.73TiB used 2.73TiB path /dev/sdf
         devid    2 size 2.73TiB used 2.24TiB path /dev/sdd
         devid    3 size 2.73TiB used 2.73TiB path /dev/sde


So I would expect around 5.4TiB to be available. In fact I am currently 
using 4.4TiB and the drive seems to be full (I cannot store more data).

I went through Marcs Blog post on this, but the hints there did not 
help. In particular:
  btrfs balance start -dusage=95 /mnt/__Complete_Disk/ (started with 55)

What's wrong here?

Regards,
Hendrik

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