[syslog-ng] OSE, Shared Storage, & Load Balanced syslog Messages

I am working on setting up OSE as a relay and would like to have storage set aside in case a destination upstream from the relay goes down. How does load balancing syslog messages work when clustering at the OS level? If I am sharing storage across multiple relays, how would I go about setting it up so that messages from one server does not overwrite another server? swp