I experienced the same iussue twice now. First time I could just go away with doing 'fsck /dev/sda3' and after the report everything was ok. But after the second occurence I can not login any more. The emergency shell does not accept my root password. I'm now completely stuck.
On my test rig I often lost the connection to my datastore and all vms came back or even didn't have any trouble with that. I gave the VCSA a try since I want to get away from the windows vcenter.
Best regards
Ansgar