[syslog-ng] High availabilty configuration

Hi, I am running open source version of syslog-ng server, currently I have only one server. I would like to add another server and configure high availability, such that log data will still be available in case my primary server dies. Looking at the documentation, syslog-ng itself does not support high availability configuration and has to be done at Operating System level. I need help setting up high availability, please point me to any resource or documentation to start with. Thanks for the help. -RB