I currently have a simple 2 node cluster, with both ESXi servers currently at version 6.0u3. The VMs are a mix of HW versions 9 and 11.
I intend to upgrade vCenter to VCSA 6.7u3 first, followed by upgrading one of the ESXi servers to 6.7u3. The other server in the cluster is not compatible with 6.7 (unsupported CPU at the very least), so it will stay at 6.0 until early next year.
I expect that the new 6.7 VCSA will be at HW version 11 since it will be created on a 6.0 host, and I just wanted to confirm that as long as I don't upgrade the HW version of any of the VMs beyond version 11, I should be able to perform a live vMotion of any of them between the 6.7 server and the 6.0 server. Is that indeed the case?
Thanks very much.
Check this KB https://kb.vmware.com/s/article/1003746
So as long as you don't upgrade the VM HW version you should be ok.
Is this a test environment?