The IP addresses associated with the SCAN VIP resources are initially set when the SCAN resources are created. Any changes to the DNS entry for the SCAN are not automatically propagated to the clusterware and need to be done manually. This applies only to installations that are not using GNS. The information in this note can also be helpful in cases where SCAN was originally configured with just one address and is now being expanded to accommodate three IP addresses. Below is an example using … [Read more...] about How to change the SCAN IP address (SCAN VIP resources) in 11gR2 Grid (CRS) environment
RAC
Oracle RAC : understanding split brain
What is a "Split Brain" Split Brain is often used to describe the scenario when two or more nodes in a cluster, lose connectivity with one another but then continue to operate independently of each other, including acquiring logical or physical resources, under the incorrect assumption that the other process(es) are no longer operational or using the said resources. In simple terms "Split brain" means that there are 2 or more distinct sets of nodes, or "cohorts", with no communication between … [Read more...] about Oracle RAC : understanding split brain