They might have, for all I know. It's doable in a product that isn't trying to do much else at the same time, if you own all the servers in question and can mak

They might have, for all I know. It's doable in a product that isn't trying to do much else at the same time, if you own all the servers in question and can make sure they are connected by a low latency network. The bad news will come when you try to keep the property of seamlessness between servers while scaling up to do other things as well.