Live Migration and Cluster Shared Volumes add high availability
With virtualization, you can drastically reduce the number of physical boxes in your environment, carving up fewer but more powerful servers into multiple virtual environments and allocating resources based on the needs of the particular guest instances. This sounds great—until you realize you’re taking all of your eggs and putting them into a much smaller number of baskets.
To manage a virtual environment well, you need to be able to move virtual machines (VMs) between the virtual servers with no downtime and provide high availability for services that don't natively support high availability. Additionally, you need ways to make virtual environments highly available. For that, you need Failover Clustering. http://windowsitpro.com/article/articleid/101489/windows-server-2008-failover-clustering.html
To learn more and to read the entire article at its source, please refer to the following page, New Hyper-V Features in Windows Server 2008 R2 – WindowsITPro.com
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