I have two redhat Linux nodes running the Oracle 18.104.22.168
Everything is OK except, when I powerdow one node (cold or soft reset). the VIP and SCAN lisnter stop working for 1+ minutes. (Using Navicat connection check, all connections are unavailabl for a while)
Is it normal? The problem is the application DB connection timeout is about 20 seconds.
Is it possible that the problem is not the listeners and VIPs, but the freeze while the global resources are re-mastered? If you have a number of instances with big SGAs this is certainly noticeable and affects all sessions. v$instance_recovery.estd_cluster_available_time might give an indication if this is the case.