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https://bugzilla.redhat.com/show_bug.cgi?id=1715699 > /dev/mapper/live-rw 6.4G 5.7G 648M 91% / > systemd-journald[905]: Fixed min_use=1.0M max_use=648.7M max_size=81.0M min_size=512.0K keep_free=973.1M n_max_files=100 When journald is started, we pick keep_free as 15% of the disk size. When the fs is almost filled, we will only keep one journal file around and rotate very often (because min_size is very small). Let's set min use to something reasonable, so that we get more useful logs that will cover at least the full boot. Some cases considered in the PR: > /dev/mapper/live-rw 6.4G 5.7G 648M 91% / keep_free→MIN(327,100)→100 MB. min_use→16MB. effective range: 16 MB – 548 MB > /dev/mapper/fedora_krowka-root 78G 69G 5.7G 93% / keep_free → MIN(4GB, 100MB)→100MB min_use→16MB effective range: 16 MB – 5.6 GB (but then there's the max_use limit, which cuts the range down) > 4TB, 4GB free keep_free → MIN(209715, 100) → 100 MB min_use→16MB effective range: 16 MB – 4.9 GB (also effectively limited by max_use) Also replace unneeded width suffixes with spaces, I think this is more readable, and drop DEFAULT_ prefixes in cases where this setting is simply a bound, and cannot be overridden by user config, hence is not a default.
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