If you use a separated VMkernel interface for vMotion, when adding the host to a Distributed Switch you still need to create/migrate the VMkernel interface for vMotion in the Distributed Switch, what you don't need to do is create a port group to the vMotion VMkernel interface, since port groups on Distributed Switch must be create only once.
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Richardson Porto
Senior Infrastructure Specialist
LinkedIn: http://linkedin.com/in/richardsonporto