Actually started and cause a near catastrophic datastore loss :O
Not necessarily the new drivers fault, but not entirely sure its not related...
I installed the new driver on one of my 3 hosts. Then I managed to set maintenance mode on via cli for one (wrong) host and since it didnt show in the gui i set again for the host I wanted to reboot.
When I noticed I tried cancelling the cli command, didnt work, closed putty.
The other box didnt go into maint but my VMs dropped all off...
So rebooted box 3 (with new driver) - but nothing came up again.
Rebooted box 1 to see whether that helped, but no go.
Rebooted box3 again after reinstalling old driver, still no difference.
At that point the whole estate was gone...
interestingly individual VMs showed 1 component present (box2) and one + witness missing (box 1/3).
Vsan health (physical disks) overall was fine so no clue....
Searching the web turned out no results ...
So in the end I managed to recover by explicitly setting maintenance mode again for box1/3 and then reboot them (twice each).
After everything was back to normal I started new
Have now rebooted box2 and am observing... there are some warnings in the manual regarding potential data store disappearance ...
edit: Forgot to mention that of course my backup VM was also on the vSan Datastore so no easy restore either :O