JNLSWITCHSZCHG, Journal AUTOSWITCHLIMIT [aaaa blocks] is rounded down to [bbbb blocks] to equal the sum of journal ALLOCATION

Run Time Information: This indicates that the specified AUTOSWITCHLIMIT value was rounded down as little as possible to make it aligned to the ALLOCATION + a multiple of EXTENSION. The new journal file created (if any) will use this value for AUTOSWITCHLIMIT.