I had 8 2TB disks running in a RAID1 setup but it started to get full so I converted it to a RAID6. However, it seems I can't use the space I've gained by switching to RAID6.My filesystem is pretty full:# btrfs fi df /mnt/r6Data, RAID6: total=6.54TiB, used=6.39TiBSystem, RAID6: total=96.00MiB, used=688.00KiBMetadata, RAID6: total=9.89GiB, used=8.72GiBGlobalReserve, single: total=512.00MiB, used=0.00BCan't resize:# sudo btrfs fi resize +1g /mnt/r6Resize '/mnt/r6' of '+1g'ERROR: unable to resize '/mnt/r6': no enough free spaceAnd the disks are only half-used:# sudo btrfs fi showTotal devices 8 FS bytes used 6.40TiBdevid    1 size 1.82TiB used 1.09TiB path /dev/mapper/disk1devid    2 size 1.82TiB used 1.09TiB path /dev/mapper/disk2devid    3 size 1.82TiB used 1.09TiB path /dev/mapper/disk3devid    4 size 1.82TiB used 1.09TiB path /dev/mapper/disk4devid    5 size 1.82TiB used 1.09TiB path /dev/mapper/disk5devid    6 size 1.82TiB used 1.09TiB path /dev/mapper/disk6devid    7 size 1.82TiB used 1.09TiB path /dev/mapper/disk7devid    8 size 1.82TiB used 1.09TiB path /dev/mapper/disk8Any ideas?
Btrfs: available space not used after migrating from RAID1 to RAID6
raid;btrfs;software raid