You should periodically check the size of log files in /usr/mmdf/log. To limit the amount of log data that accumulates in a log file, move it to another filename (for example, chan.log-).
If you move aside a log file, make sure that
mmdf owns the new empty file.
To back up the log file and create a new empty file,
enter these commands as mmdf:
cp chan.log chan.log-
cat /dev/null > chan.log