1.If all the nodes in the cluster are needed in order to perform adequately, then it is not HA ( High Availability) 2.RAC only makes up one piece of the MAA(Maximum Availability Architecture); it does not account for all possible problems.
1. OCR Mirroring
2. From Oracle @ work
3. From Pythian ...
Q. How to see the cluster name?
$cemutlo -n >crs