VMWare’s vSphere tout a new feature called Fault Tolerance (FT).
It is interesting because many Fault Tolerance features should give you maximum resiliency against faults.
Before you decide to dive into this, read this link that talks about its limitations.
http://vmjunkie.wordpress.com/2009/06/11/why-you-may-want-to-leave-ft-alone-for-now/
