I should have plenty of space for this operation, but it fails....
cartman {~} root# btrfs filesystem df /
Data, RAID1: total=7.59GiB, used=7.00GiB
System, RAID1: total=32.00MiB, used=4.00KiB
Metadata, RAID1: total=1.00GiB, used=438.45MiB
unknown, single: total=148.00MiB, used=0.00
Filesystem Type Size Used
Avail Use% Mounted on
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa btrfs 19G 15G
3.1G 84% /
cartman {~} root# btrfs fi show
Label: 'Root' uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
Total devices 2 FS bytes used 7.43GiB
devid 1 size 9.31GiB used 8.06GiB path
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
devid 3 size 9.31GiB used 8.06GiB path /dev/sdd6
Label: 'Storage' uuid: 179749c1-1bfb-4f28-9c69-72126c96cdef
Total devices 8 FS bytes used 1.83TiB
devid 1 size 149.05GiB used 149.04GiB path /dev/sde
devid 2 size 149.05GiB used 149.05GiB path /dev/sdh
devid 3 size 465.76GiB used 465.76GiB path /dev/sdc
devid 4 size 465.76GiB used 461.70GiB path /dev/sdf
devid 5 size 465.76GiB used 461.00GiB path /dev/sda
devid 6 size 465.76GiB used 461.00GiB path /dev/sdb
devid 7 size 920.34GiB used 843.00GiB path /dev/sdg7
devid 9 size 1.81TiB used 755.00GiB path /dev/sdd7
Btrfs v3.16
cartman {~} root# btrfs balance start /
ERROR: error during balancing '/' - No space left on device
There may be more info in syslog - try dmesg | tail
Sep 13 16:35:42 localhost kernel: BTRFS info (device sdg6): found 33544
extents
Sep 13 16:35:51 localhost kernel: BTRFS info (device sdg6): found 33541
extents
Sep 13 16:35:52 localhost kernel: BTRFS info (device sdg6): relocating
block group 80153214976 flags 18
Sep 13 16:35:53 localhost kernel: BTRFS info (device sdg6): found 1 extents
Sep 13 16:35:54 localhost kernel: BTRFS info (device sdg6): relocating
block group 79680700416 flags 17
Sep 13 16:36:03 localhost kernel: BTRFS info (device sdg6): found 32545
extents
Sep 13 16:36:09 localhost kernel: BTRFS info (device sdg6): found 32545
extents
Sep 13 16:36:10 localhost kernel: BTRFS info (device sdg6): relocating
block group 79412264960 flags 20
Sep 13 16:36:12 localhost kernel: BTRFS info (device sdg6): found 1114
extents
Sep 13 16:36:13 localhost kernel: BTRFS info (device sdg6): relocating
block group 79143829504 flags 20
Sep 13 16:36:37 localhost kernel: BTRFS info (device sdg6): found 59076
extents
Sep 13 16:36:38 localhost kernel: BTRFS info (device sdg6): relocating
block group 78875394048 flags 20
Sep 13 16:37:01 localhost kernel: BTRFS info (device sdg6): found 59268
extents
Sep 13 16:37:02 localhost kernel: BTRFS info (device sdg6): 6 enospc
errors during balance
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