cat /etc/syslog-ng/syslog-ng.conf
options {
        chain_hostnames(off);
        sync(0);

        # The default action of syslog-ng 1.6.0 is to log a STATS line
        # to the file every 10 minutes.  That's pretty ugly after a while.
        # Change it to every 12 hours so you get a nice daily update of
        # how many messages syslog-ng missed (0).
        stats(43200);
};

source src { unix-stream("/dev/log"); internal(); };

destination messages { file("/mnt/sdb1/var/log/messages"); };

log { source(src); destination(messages); };