The input arguments had entities that did not belong to the same datacenter.

Symptoms

Trying to vMotion (in my case a cross-vCenter vMotion from a 6.5 system to 6.7) a VM the error “The input arguments had entities that did not belong to the same datacenter.” occurred. Other VMs were migrating fine.

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Cause

The CD Drive in the source VM was mapped to (although not connected to) a Content Library ISO file.

Solution

Point the source VM CD drive at “Client Device” and retry the vMotion.

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