When you have access to a unix server and someone asks for help and you do not know about all the possible log files that exists, here is a command that will show you ALL opened file for append or write.
ulimit -n 9999 # In case there is more than 1024 files!
tail -vF $(/usr/bin/lsof -n | egrep -i '[[:digit:]]+(u|w).*reg' | awk '{print $9}')
Thanks Marius! :)