Some months ago I have implemented an Active Passive Solution on Oracle 11gr2 for on one of the customers. Basically this was almost reliving old days where tools like HP MC Service Guard (using packages where one or more database and listener configurations are stored) or Veritas Clusterware (where and Agent controls the status of the resources being a database and or a listener). They would monitor the health of the Database/Listener, would stop and start the Database/ Listener. With the technology at hand at that point and time ( implemented 184.108.40.206 Grid Infra with ASM and 220.127.116.11 Rdbms ) it was not having all the required setups to implement anything else. Now we are 9 months further in time, standards have been adapted and we have latest Oracle version at hand ( being 18.104.22.168) so it is time for a fresh start. Besides that recently I have been asked to implement the Active Passive solution on more environments (since it does cover part off HA and it controls the monitoring of the Database/ Instance by HP-Openview).