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If Linux reports "Low Disk Space" despite having many GB free, #

the cause may be the default 5% of filesystem blocks reserved for root by ext4:

Check via dumpe2fs:

$ sudo dumpe2fs /dev/vda2 | grep -i "block count"
...
Block count:              16645632
Reserved block count:     832281

(832281/16645632 x 100 ≈ 5.00%)

Remove the reservation:

$ sudo tune2fs -m 0 /dev/vda2
...
Setting reserved blocks percentage to 0% (0 blocks)

Check once more:

$ sudo dumpe2fs /dev/vda2 | grep -i "block count"
...
Block count:              16645632
Reserved block count:     0

/nix | Apr 08, 2023

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