Issue:
A backup is run on a VM to an attached drive on shared storage which is thin provisioned. That storage has not been monitored closely and runs out of space which forces the LUN offline. Suddenly the ESXi hosts start randomly disconnecting from Virtual Center. You cannot connect directly to the host through the client, but you can access the host through SSH. You attempt to connect the host to Virtual Center, but it also fails.
Resolution
- Connect to host through SSH and run /sbin/services.sh restart.
- Now run /sbin/services.sh restart again
- Once again, run /sbin/services.sh restart
- You will now be able to connect the host to Virtual Center.