8) Host intrusion detection and prevention - Host intrusion protection should continue to be in place as it would with a stand-alone server. Be sure to test your intrusion detection and prevention software within the virtual environment. Check with your vendor to be sure it is officially supported when running in a virtual environment.
Does it always make sense to virtualize?
It is important to keep critical authentication and directory services on dedicated systems. In most cases Active Directory domain controllers, RSA authentication manager servers, and RADIUS servers should not be run in a virtualized environment. However, there are exceptions to this, especially with regards to disaster recovery initiatives.
Although some firewall vendors are beginning to provide virtualization-ready solutions, it is best to hold off on virtualizing your firewall servers for now. While the idea of hosting multiple firewalls as virtual servers on a single host is appealing, you are likely running multiple firewalls that serve very different needs—with different security policies and rules. Keep these systems on their own servers for now.