How to know which node is the master node in oracle RAC

 You can verify by using these blow options:


1. grep the ocssd logfile contents by searching a key word "master node"

Go to the location of cssd logfile and run the below command:

grep -i "master node" ocssd.log | tail -1

Output: 

[CSSD]CLSS-3001: local node number 1, master node number 1


2. grep crsd logfile contents by searching a key word "MASTER"

Go to the location of crsd logfile and run the below command:

grep MASTER crsd.log | tail -1


3. By querying the database view  "V$GES_RESOURCE" 

4. by locating the OCR backup, because the node that store OCR backups is the master node.

ocrconfig -showbackup


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