If you do this for every transaction, you'll have more overhead than you'd have if you had just performed distributed consensus. But in principle you're right.

If you do this for every transaction, you'll have more overhead than you'd have if you had just performed distributed consensus. But in principle you're right. It makes sense to put all the primary copies that are often used together on the same node. The problem is that it's hard to decide the ideal placement strategy. VoltDB puts this responsibility into the hands of the developers.