Hi,
We are seeing some VMs randomly dropped off the network as well on 6.7. I am not sure what triggers it but sometimes it happens after a vmotion.
In fact, we vmotioned the VM to 7 machines in our cluster and continued to ping the VM. On 4 out of 7 we got ping; the other 3 no dice.
Yet later one of the machines we had successful testing on also dropped the machine from the network.
DRS is on... and backup recovery automation is happening too ( I can see snapshots occurring in the events pane).
This machine is linux while the other machines are windows based. We were going to move the machine to a non DRS cluster but we know now it happens without vmotioning.
What didn't work:
-Upgrading hardware version of the VM
-Updating NIC from e1000 to VMNET3
We are at a loss at how to keep this machine up.
Another thing we noticed which may or may not be related: Someone who is given explicit rights to the machine (and no other rights) can not solve the problem with a reboot or restart; however, Cluster admins CAN remedy the problem with a reboot. So there could be some permissioning failures related to what's happening in the background. That's just a hunch, as nothing is showing up in the VM's log.