The issue occurs when the CPU capabilities of the two hosts are not the compatible. vMotion requires that the CPU capabilities between the hosts must be the same.
- In vCenter Server, click the Summary tab and check the CPUs architecture.
- Ensure that the affected hosts have the same BIOS settings. For more information on how to access your system BIOS, see the hardware vendor documentation.
For more information read this Vmware knowledge base article.
Posted in: VMware vSphere