I am working a lot with multiple Linux + OpenWrt builds on top of a btrfs
filesystem. But I am encountering often that my filesystem is considered
full by btrfs (beside having more than 40% free space). The only thing
looking full is the metadata. I've tried to run the balance command with
-dusage=0 but it didn't help. The metadata size stayed at 10G and was
filled up to nearly 10G.
My question is: Can this metadata size limit be changed to allow more
small files on the filesystem? And if yes, how?
According to the kernel btrfs documentation, metadata_ratio= is
currently off by default. So I would guess that this ratio is not
the thing I should play with.
Here the requested information of my fs (after removing a lot of build
directories):
franzbroetchen# uname -a
Linux franzbroetchen 4.0.0-1-amd64 #1 SMP Debian 4.0.2-1 (2015-05-11) x86_64 GNU/Linux
franzbroetchen# btrfs --version
btrfs-progs v4.0
franzbroetchen# btrfs fi show
Label: 'root' uuid: 57fe2100-0510-11e5-977e-0021ccb48233
Total devices 1 FS bytes used 182.55GiB
devid 1 size 467.68GiB used 206.06GiB path /dev/mapper/franzbroetchen_vg-root
btrfs-progs v4.0
franzbroetchen# btrfs fi df /
Data, single: total=190.00GiB, used=176.47GiB
System, DUP: total=32.00MiB, used=48.00KiB
Metadata, DUP: total=8.00GiB, used=6.08GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
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