You can try out guest clustering by downloading the Windows Server 2012 evaluation Did you know that virtual machines can also be clustered? 


Yep.  We call it “guest clustering”, where a cluster of application-hosting computers, sharing storage, are actually virtual machines.  In this way we provide a “whole ‘nuther level of high availability” in the fact that if an application can benefit from and take advantage of being cluster-aware, then we can support that availability even while the application is running on virtual machines. 

In part 14 of our “20+ Days of Server Virtualization” series, Keith Mayer describes the benefits and operations of virtual machine guest clustering in great detail, as well as some of the improvements to Hyper-V in Windows Server 2012 that make it even more powerful.