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VMware vCenter Cookbook by Konstantin Kuminsky

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Using hosts with different CPUs in one cluster

One of the core vSphere features is vMotion. It allows administrators to move a running virtual machine from one host to another without interruption.

Unfortunately, one of the requirements for vMotion is to use hosts with the same processors so that the virtual machine that has been moved can keep running on a new host. This is due to the fact that newer processors, even within the same family, typically have additional features. New generations of processors can also have a different set of instructions. When features or instructions an application is using are not available, the application will crash.

Clusters consisting of hosts with different CPU generations can use Enhanced vMotion Compatibility ...

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