Re: BTRFS constantly reports "No space left on device" even with a huge unallocated space

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Hi again guys!

After I rebooted the computer, I still can't run balance on metatada:

btrfs balance start -musage=1 /
ERROR: error during balancing '/': No space left on device
There may be more info in syslog - try dmesg | tail

dmesg shows:

[ 2022.530285] BTRFS info (device sda6): relocating block group
128509280256 flags 36
[ 2023.355206] BTRFS info (device sda6): relocating block group
127972409344 flags 36
[ 2024.265313] BTRFS info (device sda6): relocating block group
127435538432 flags 36
[ 2025.646712] BTRFS info (device sda6): relocating block group
126898667520 flags 36
[ 2026.794791] BTRFS info (device sda6): relocating block group
126361796608 flags 36
[ 2028.023517] BTRFS info (device sda6): relocating block group
125824925696 flags 36
[ 2028.881287] BTRFS info (device sda6): relocating block group
125288054784 flags 36
[ 2029.739342] BTRFS info (device sda6): relocating block group
124751183872 flags 36
[ 2030.631990] BTRFS info (device sda6): relocating block group
124214312960 flags 36
[ 2031.523176] BTRFS info (device sda6): relocating block group
123677442048 flags 36
[ 2032.407859] BTRFS info (device sda6): relocating block group
123140571136 flags 36
[ 2033.806672] BTRFS info (device sda6): relocating block group
122603700224 flags 36
[ 2035.237712] BTRFS info (device sda6): relocating block group
122066829312 flags 36
[ 2038.257268] BTRFS info (device sda6): relocating block group
122033274880 flags 34
[ 2039.911443] BTRFS info (device sda6): relocating block group
121496403968 flags 36
[ 2040.958106] BTRFS info (device sda6): relocating block group
120959533056 flags 36
[ 2041.841051] BTRFS info (device sda6): relocating block group
120422662144 flags 36
[ 2042.828359] BTRFS info (device sda6): relocating block group
119885791232 flags 36
[ 2044.297744] BTRFS info (device sda6): relocating block group
119348920320 flags 36
[ 2045.684932] BTRFS info (device sda6): relocating block group
118812049408 flags 36
[ 2046.761787] BTRFS info (device sda6): relocating block group
118275178496 flags 36
[ 2048.200756] BTRFS info (device sda6): relocating block group
117738307584 flags 36
[ 2049.806986] BTRFS info (device sda6): relocating block group
117201436672 flags 36
[ 2051.170470] BTRFS info (device sda6): relocating block group
116664565760 flags 36
[ 2051.910536] BTRFS info (device sda6): relocating block group
116127694848 flags 36
[ 2052.678395] BTRFS info (device sda6): relocating block group
115590823936 flags 36
[ 2053.737959] BTRFS info (device sda6): relocating block group
106363355136 flags 36
[ 2054.852065] BTRFS info (device sda6): relocating block group
105826484224 flags 36
[ 2055.911187] BTRFS info (device sda6): relocating block group
105222504448 flags 36
[ 2057.047407] BTRFS info (device sda6): 4 enospc errors during balance

and I have:

btrfs fi usage /
Overall:
    Device size:		   1.26TiB
    Device allocated:		  80.07GiB
    Device unallocated:		   1.18TiB
    Device missing:		     0.00B
    Used:			  41.95GiB
    Free (estimated):		   1.18TiB	(min: 603.95GiB)
    Data ratio:			      1.00
    Metadata ratio:		      2.00
    Global reserve:		 352.00MiB	(used: 576.00KiB)

Data,single: Size:40.01GiB, Used:39.95GiB
   /dev/sda6	  40.01GiB

Metadata,DUP: Size:20.00GiB, Used:1.00GiB
   /dev/sda6	  40.00GiB

System,DUP: Size:32.00MiB, Used:16.00KiB
   /dev/sda6	  64.00MiB

Unallocated:
   /dev/sda6	   1.18TiB

Hope this brings new information!

Best regards,
Ronan Arraes
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