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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.
CHECK OUT HIS EXCELLENT ARTICLE HERE