1st configuration: 4 cluster nodes, 3 instances per cluster node (quorum), 1 instance
per cluster host node, 12 cluster host nodes; 2nd configuration: 4 cluster nodes, 3
instances per cluster node (quorum), 4 instances per cluster host node, 12 cluster host nodes: -- This is more
to do with how many Virtuoso Server processes are running per cluster node. You will have more OS resources
available as the Virtuoso instances are reduced. Ideally, you want to spread the instances over distinct
machines so that you have resources pooled across those machines. One instance per cluster node will work better
than Four instances per cluster node.