Comment by sfink

Ah, right. The joys of being a fool in public.

The part I missed is that the load balancers don't have a consistent view of the set of servers. There is no magical synchronization scheme that creates that consistent view. You want load balancers with slightly different ideas of what servers are available to mostly make the same choices for the servers they do agree on.

Doh! I should have been able to infer that from the original solution.