Thanks Perry. Again, what is split brain? I have read that whenever private/heartbeat network fails, split brain occurs?

Consider I have a 3 node cluster (N1,N2,N3) and private network completely is down on N1 and cannot communicate to other nodes.

and private network is not set for "All communications", so I would a expect a failover from N1 to next possible owner. It could be N2 or N3 depending on install order.

1) Now, my doubt is when does the split brain happen or when can a split brain situation occurs?

2) What happens if a split brain occur?

3) What will happen to a cluster in that scenario? Is there any auto healing functionality to come out of that situation?