The size of the MySQL log files (mysql-bin-*) are checked every 7 days. If the log files consume more than 1 GB of total disk space at the time they are checked, the files are deleted.
If you want to delete the log files before the automatic check runs on day 7 or before the files reach the 1 GB threshold, you can manually trigger the log files to be deleted:
Restart the MySQL database appliance (as described in Section 7.9, Shutting Down and Restarting the Novell Appliance.)
Run the flush logs command from the MySQL appliance (mysqladmin flush-logs).