I've made fixes to ensure session information is always stored in moodledata
That's great! So, as long as the URL is the same, pretty much any load balancing scheme will work. No worries then, just set up round robin DNS (trivial) and hook up a cluster to a MySQL/NFS server.
it was in the wrong thread to start with.
Sorry, I didn't think that so many poeple would be interested in the post