[syslog-ng] Distributed syslog architecture

Hi all, I am working on a project to build distributed syslog-ing system for a very lager enterprise with offices all across the globe. Below are the main objectives: 1. Support for primarily network devices, like ciscos, netscreens, junipers etc 2. Minimum or no loss of messages when network fails 3. Central storage of all syslog messages Could you please give me your ideas or point me to any documentation that deals with such designs? Thank you!