systemd-journald and full disk /var/log after logrotate

Hi,

  I have problem with full disk /var/log and to problem is with systemd-journald. I can't understand, how it works.

•   armbian-truncate-logs works fine. When is /var/log more than 75% full, the script truncates a log and files are copied to disk /var/log.hdd -> no problem here
• before midnight is my /var/log 40% full
• after midnight is my /var/log 100% full

  When I was investigating, where the problem was, I found that /var/log.hdd was bigger than the size of my partition /var/log.

  The biggest folder is /var/log.hdd/journald

 There are so many files in /var/log.hdd/journald

  And after midnight is systemd-journald processing all these files from /var/log.hdd/journald and the files are copied to /var/log

  And I don't understand why is it happening. The purpose of logrotate should be reverse. I was expecting, that systemd-journald was working with /var/log/journald and could copy files to /var/log.hdd/journald. But it looks like, that it is merging both folders to /var/log/journald after midnight. 

  The question is why and how can I disable it.

  If I delete content from /var/log.hdd/journald, system works for a week. Each day I see, that /var/log.hdd/journald is bigger then day ago. And when is /var/log.hdd/journald bigger then size of my disk at /var/log/journald, the problem is back. 

  Nobody has the same problem? My problem is from clean install.

  You can see my log after midnight:

Journal file /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-000000000000b996-0005f4ae0dbec4c9.journal is truncated, ignoring file. [0m
Vacuuming done, freed 0B of archived journals from /var/log/journal.
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Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-000000000003203b-0005f55fe20add0d.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-00000000000322f7-0005f560baae2189.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-00000000000325c1-0005f56189b773b1.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-0000000000032883-0005f5626bf9884a.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-0000000000032e11-0005f5641b65716c.journal (576.0K).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-0000000000037cfd-0005f5794de7a3f6.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-0000000000037d6d-0005f57965404b9d.journal (1.2M).
Deleted archived journal /var/log/journal/078479a1b0a4459f80590dd571c3d6de/system@db2ec42ff4cf4233af41703b585ba10a-0000000000037e06-0005f57983b9afda.journal (1.2M).
Vacuuming done, freed 92.8M of archived journals from /var/log/journal/078479a1b0a4459f80590dd571c3d6de.
Vacuuming done, freed 0B of archived journals from /run/log/journal.
Deleted archived journal /run/log/journal/078479a1b0a4459f80590dd571c3d6de/system@3bdefe573aec4437942ac90ad8fb9a78-000000000003e7fb-0005f57a429628c4.journal (1.2M).
Deleted archived journal /run/log/journal/078479a1b0a4459f80590dd571c3d6de/system@3bdefe573aec4437942ac90ad8fb9a78-000000000003ed90-0005f57a43e486d5.journal (1.2M).
Deleted archived journal /run/log/journal/078479a1b0a4459f80590dd571c3d6de/system@3bdefe573aec4437942ac90ad8fb9a78-000000000003f32a-0005f57a44db0b57.journal (1.2M).
Deleted archived journal /run/log/journal/078479a1b0a4459f80590dd571c3d6de/system@3bdefe573aec4437942ac90ad8fb9a78-000000000003f8bf-0005f57a469d9107.journal (1.2M).
Vacuuming done, freed 5.0M of archived journals from /run/log/journal/078479a1b0a4459f80590dd571c3d6de.

But none of the files were in /var/log/journal before midnight. But all of them were in /var/log.hdd/journal before midnight.

Does anybody understand, what's happening?