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I have seen customers removing & adding nodes. Removing node is easy.
Before you decide removing the node you need to check load on the system. We dont know about your application and system load.
If you have any test environment you can simulate the load and test.
refer below link to simulate the load using Oracle Database Replay in 11g
Hope this helps,
ORA-00600: internal error code, arguments: [krcrfi_nohist]
Oracle RMAN backup fails with ORA-01031 insufficient privileges
I would suggest you to stop the services from the node to be deleted and monitor the application performance for few days and if you find there is no such regression in application performance and no such complain from user end, I think you can go ahead for deletion of one of cluster node.