is this a known issue ?
It is not a known issue, but the best practise suggested by VMware to avoid issues like you have mentioned.
Can something be done in the scenario I have ...
- Well, it is entirely upto you. What you can do is trigger vRanger backup one VM by one and find out which VMs backup might cause this or at wat load of VM does the heartbeat gets timed out.
- Again as suggested in the KB, you can increase the heartbeat timeouts.
one vSwicth with all port groups in it and with 6 NIC's
Though you have NIC Teaming, it might be the same 6 Nics which carry out the Management/VM traffic which might cause this.
anything else that I can work on
Let us try to see if vpxa.log says anything on this? Could this kb be a little helpful