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man: Improve text for SystemMaxFileSize when not set
If one sets the SystemMaxUse=64G by the current documentation would expect that each files size would be around 1/8 of this value (8G), althought if the SystemMaxFileSize is not explicit set, it has a max of 128M per file.
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<para><varname>SystemMaxFileSize=</varname> and <varname>RuntimeMaxFileSize=</varname> control how
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large individual journal files may grow at most. This influences the granularity in which disk space
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is made available through rotation, i.e. deletion of historic data. Defaults to one eighth of the
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values configured with <varname>SystemMaxUse=</varname> and <varname>RuntimeMaxUse=</varname>, so
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that usually seven rotated journal files are kept as history. If the journal compact mode is enabled
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(enabled by default), the maximum file size is capped to 4G.</para>
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values configured with <varname>SystemMaxUse=</varname> and <varname>RuntimeMaxUse=</varname> capped
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to 128M, so that usually seven rotated journal files are kept as history. If the journal compact
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mode is enabled (enabled by default), the maximum file size is capped to 4G.</para>
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<para>Specify values in bytes or use K, M, G, T, P, E as units for the specified sizes (equal to
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1024, 1024², … bytes). Note that size limits are enforced synchronously when journal files are
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