this post was submitted on 30 Apr 2024
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How to figure out why BTRFS drive reports it is out of space (lemmy.sdf.org)
submitted 4 months ago by daq@lemmy.sdf.org to c/linux@lemmy.ml
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# sudo btrfs fi df /mnt/disk3
Data, single: total=12.70TiB, used=12.27TiB
System, DUP: total=8.00MiB, used=1.34MiB
Metadata, DUP: total=15.00GiB, used=14.50GiB
GlobalReserve, single: total=512.00MiB, used=608.00KiB

# mkdir /mnt/disk3/tst
mkdir: cannot create directory ‘tst’: No space left on device

I suspect this is BTRFS balancing issue, but even BTRFS's own utility is indicating there's still SOME space left. Certainly should be enough to create a directory.

Any ideas?

Just in general BTRFS default options for creating new volumes seem to not work well for disks that I intend to fill completely immediately after formatting. Are there better options for this use case? I just use

# mkfs.btrfs /dev/sdd1

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[–] daq@lemmy.sdf.org 3 points 4 months ago

Are you sure that's the case with btrfs? I know ext has that feature. My understanding is btrfs just has a global reserve that can be used for any data in an low space situation.

# sudo btrfs fi usage /mnt/disk3
Overall:
    Device size:                  12.73TiB
    Device allocated:             12.73TiB
    Device unallocated:            1.00MiB
    Device missing:                  0.00B
    Device slack:                    0.00B
    Used:                         12.29TiB
    Free (estimated):            449.43GiB      (min: 449.43GiB)
    Free (statfs, df):           449.43GiB
    Data ratio:                       1.00
    Metadata ratio:                   2.00
    Global reserve:              512.00MiB      (used: 0.00B)
    Multiple profiles:                  no

Data,single: Size:12.70TiB, Used:12.26TiB (96.55%)
   /dev/sdd1      12.70TiB

Metadata,DUP: Size:15.00GiB, Used:14.49GiB (96.58%)
   /dev/sdd1      30.00GiB

System,DUP: Size:8.00MiB, Used:1.34MiB (16.80%)
   /dev/sdd1      16.00MiB

Unallocated:
   /dev/sdd1       1.00MiB