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Don Burleson Blog 







Oracle RAC node eviction tips

Oracle Tips by Burleson Consulting
August 27, 2008

 I understand what can cause a RAC node to be evicted from the cluster, but I can’t find the process for deciding which node will be rebooted after the eviction. Oracle’s explanations on MOSC say "a node" but in my testing it is always a particular physical machine and not the secondary instance.

What would happen in a 3 or 4 node cluster when you have a RAC node eviction? Is it safe to assume it will be instance 2 every time no matter which side of the interconnect goes down?
Answer: MOSC has this note on RAC node eviction:
“The node with the lower node number will survive the eviction (The first node to join the cluster).
In case of 3 nodes, 2 nodes will survive and the one you pulled the cable will go away.
4 nodes - the sub cluster with the lower node number will survive.”




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