Apache and nginx both have an array of good LB algos. I've never seen IP-based LB or hot-spots really. Most app servers support session replication/backup to

Apache and nginx both have an array of good LB algos. I've never seen IP-based LB or hot-spots really. Most app servers support session replication/backup to other node(s). This is really standard stuff in JBoss for instance (my world). Problems that have been solved for years and used at massive scale.