EFM support only PostgreSQL Streaming Replication.

A virtual IP address (VIP) is an IP address that doesn't correspond to an actual physical network interface. Uses for VIPs include network address translation, fault-tolerance, and mobility. In EFM, VIP will help you to make auto-failover operation seamless from Application point of view. With the help of VIP, after the auto-failover there is no

If master node failed then EFM will send notification to DBA about the master node failure and perform auto-failover to your most up to date standby server. So, that server will become master server.

If standby node failed then EFM will send notification to DBA about the standby node failure. Here, in this case only standby server failed hence it will not perform auto-failover.