I have a few questions regarding the ESXi → XCP-ng migration process and how Xen Orchestra handles it internally.

1. When VDDK is available and configured, how does the migration process work exactly?
2. Is the data transfer happening directly between the ESXi host and the XCP-ng host, or is the traffic proxied through Xen Orchestra as well?
3. I understand that migration can also work without VDDK. In that case, what method is used internally?
4. If VDDK is installed/configured in Xen Orchestra, is it possible to manually choose which migration method to use? I’m asking mainly for testing and benchmarking purposes. Or does XO automatically decide which method will be used?

Thanks in advance for any clarification.