How can I virtualize my mission-critical servers while maintaining or improving security?

In a virtual environment, the security challenges multiply rapidly and introduce new risks. Where an
organization might have had a single application server in the past, in a virtual environment they
could see that quickly evolve to thirty servers. How can security, such as segregation of duties for
privileged users, be enabled, not only on a physical server, but also on the virtual machines it hosts,
as well as the applications running on those virtual machines? The lack of a viable security solution
for virtual environments has been holding many organizations back from moving their mission-critical
applications there and taking full advantage of virtualization. For organizations that are virtualizing
production systems rapidly, business and regulatory requirements are demanding new security controls.