I had a full disk usage on /var/log (100%) and deleted a few files to increase space. this is and ext4 partition mounted with default options.

However, when I df -h I get:

Filesystem                       Size  Used Avail Use% Mounted on
/dev/mapper/vg00-log             945M  885M     0 100% /var/log

Why is it reporting that 885M is 100% of 945M?


The reserved space is not included in the % free. Run dumpe2fs -h /dev/mapper/vg00-log to see the reserved space ("reserved block count."). tune2fs -m will change that count.

See also, e.g., https://askubuntu.com/questions/79981/df-h-shows-incorrect-free-space

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