How to figure out why BTRFS drive reports it is out of space (lemmy.sdf.org)

submitted 6 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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[-] Hawke@lemmy.world 4 points 6 months ago* (last edited 6 months ago)

Is there any reason this 5% number still holds true? Back in the days of 40 MB hard drives it made sense to make sure the system didn’t totally run out while root was fixing the low disk situation … but these days even 1% is still several gigabytes of space, not likely to run out that quickly.

[-] daq@lemmy.sdf.org 4 points 6 months ago

https://xkcd.com/1172/

[-] ryannathans@aussie.zone 2 points 6 months ago

Fragmentation probably but seems arbitrary

this post was submitted on 30 Apr 2024

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