Hi, I had a question regarding the High Availability of our 12c OEM repository. We have setup our OEM following the high availability guide from Oracle. We have two sites with and OMS service running on each site pointing to our primary database repository. We have the F5 load balancer in place. There is a standby database repository on the alternate site that is physical standby database via Dataguard. When I do a Dataguard switchover to the alternate site and redirect the OMS’s to point to the new location of the repository everything thing works great. We are going to be disaster testing soon and the scenario is a complete site loss. The thing that bugs me is when I switch the database and OMS’s over to the alternate site and do a “emctl status oms –details” under the WLS Domain Information section the “Admin Server Host” still says it’s pointing to the primary site. How can I ensure that when I lose my primary site entirely that my OEM and OMS will still be able to function? Do I need an additional WLS Domain on my alternate site?
OMS Version 220.127.116.11
Repository database version 18.104.22.168
For installing StandBy OMS you require different domain named as (GCDomainStby) instead primary WLS domain (By default: GCDomain).
Once you complete the StandBy OMS installation then do a failover from Primary site to StandBy then you will notice that it is pointing to StandBy host.
Another key point,
I assume you have already done this. If not you will need to add the standby Weblogic Domain and associated targets in OEM console using the Guided Discovery process.
From the Setup menu, select Add Target , then select Add Targets Manually. Select Oracle Fusion Middleware from the Target Types menu. Use the secure port (typically 7101) and, under Advanced, set the JMX Protocol to t3s.
Note that the WebLogic targets, except the Administration Server, will be shown as down when the standby OMS is down. It will show up when you test your standby OEM setup.
This information is provided in point 9 in the above link provided by Mani.