Hello, good people

This is my problem:
Recently our company bought two Exadata racks Eight Rack (every one in RAC One Node configuration). Linux x86_64, Oracle 11.2.0.3 Enterprise Edition.

I rebooted one node (Node1) managing live instance, and i thought that other, "surviving" node (Node2) will automatically mount and open an instance. But, nothing was happened during reboot of Node1. After the Node1 was up, instance was automatically started, mounted and opened on Node1.During the reboot, database was down

What I am doing wrong? Just to say, I didn't find very useful documentation about RAC One Node.

Thanks a lot!