I've set up a lab environment with multiple hosts + shared storage in order to try out the 'Deploying the IAM Suite 11gR2PS2 with the Deployment Wizard ('Single Node on Multiple Hosts' Topology)'.
db.oracle.com - Windows
oudhost1.oracle.com - OES 6.5
oamhost1.oracle.com - OES 6.5
oimhost1.oracle.com - OES 6.5
webhost1.oracle.com - OES 6.5
nas.oracle.com - FreeNAS 9.3
Because I haven't set up DNS server, I've added all the host/ip mapping in /etc/hosts on all VMs.
Make sure the firewall should be disabled on all VMs.