I have two 3TB drive that are formated as btrfs and mounted on /media/andy/btrfs as one drive.
btrfs balance start -dconvert=raid1 -mconvert=raid1 /media/andy/btrfs/ which takes forever.
ERROR: error during balancing '/media/andy/btrfs/' - Input/output error There may be more info in syslog - try dmesg | tail
There's an output there, it's very long.
Sure enough, I try
btrfs filesystem df /media/andy/btrfs
Data, RAID1: total=1.14TiB, used=1.13TiB
Data, single: total=106.01GiB, used=94.40GiB
System, DUP: total=8.00MiB, used=184.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, RAID1: total=1.00GiB, used=1017.65MiB
Metadata, DUP: total=1.00GiB, used=441.45MiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=488.00MiB, used=0.00B
So sure enough I have 106 GiB that's not in raid. Anyone has an idea how to fix this? I'm running Debian testing. Kernel 3.16.7