Just found that /var/log/boot.log is empty on our database server with In RHEL 5. So we can’t able to see the start up log for services during the server’s start to find why Oracle 11g doesn’t load. Quick googling helps to find a workaround with boot log.
You need to edit the “/etc/init.d/functions” file to uncomment 3 lines of code in 4 sections: success, failure, passed, warning. Continue reading boot.log empty in Redhat 5