Hi
I have the same problem.
It can be concluded that one in vDS uplink can connect only one port-channel with LACP. In the port-channel contains only NICs from one ESX host. On the other ESX NICs can not enter. If one ESX die, as in this case, to implement fault tolerance?
Please see the attached chart. Image may be NSFW.
Clik here to view.
Clik here to view.

My uplink connection scheme is not true?