Need recommendation - iis with two physical servers and clusters

Hello,
I was hoping to get a recommendation/opinion or two on the configuration I've inherited. I'm looking
at the following configuration using weblogic 8.1 sp4 server (to be upgraded to sp6) running on two physical machines:
MachineA:
Domain: myDomain
Cluster: cluster1
Servers: Admin Server:9001 (not part of cluster)
ManagedServer1:7001
ManagedServer2:7010
MachineB:
Domain: myDomain
Cluster: cluster2
Servers: Admin Server:9001 (not part of cluster)
ManagedServer3:7001
ManagedServer4:7010
On MachineA: IIS Proxy Plugin with parameter in .ini file
WeblogicCluster: MachineA:7001, MachineA:7010, MachineB:7001,MachineB7010
Naturally, the IIS is acting as a round robin load balancer..
The domains were created using the wizard on both machines and basic domain template..
For proper failover to be taken advantage of, does something different need to be configured? Or is it fine?
And if so, does group replication have something to do with it?
Should either of the clusters be Managed Servers across physical machines?
or should this just be one cluster of 4 managed servers across two machines?
I really am not sure on any of this, even though i've read through much of the documentation for clustering..twice.
I should mention that there is only a .war file deployed with 4 connection pools and 4 Data Sources..No EJBs or JMS
Would really appreciate any feedback or opinions/advice..
Thanks

This is what I'd do
MachineA:
Domain: myDomain
Cluster: cluster1
Servers: Admin Server:9001 (not part of cluster)
ManagedServer1:7010
ManagedServer2:7020
MachineB:
Domain: myDomain
Cluster: cluster2
Servers: Admin Server:9001 (not part of cluster)
ManagedServer3:8010
ManagedServer4:8020
I just changed the port numbers so they flow and have a pattern - 70* port numbers belong to cluster 1, 80* port numbers belong to cluster 2. No technical benefit apart from it makes it tidier in my opinion.
Port 9001 for the admin server is normally the domain wide admin port - you could be using that, so that's fine, but my admin server is running 7001.
You also only need one admin server per domain, this can run on MachineA
Replication groups are used to help WLS figure out where to place the secondary http session. It will try servers on a different machine/replication group first, if none available, it will create secondary on the same machine.
What you will end up with is a domain with 4 managed servers in it. The admin server will run on machineA, say using port 7001, each of the managed servers will contact the admin server to download it's config.
The cluster1 will contain 2 managed servers and the same for cluster2.
providing you have your cluster multicast addresses set up and the cluster is working, that should be all you need to do for the session failover.
There's some BEA sample code somewhere which will deploy a web-app and show which managed server you've attached to. If you find that and then connect through IIS, shut down the server that the JSP tells you, you should be able to see the session fail-over nicely.
Hope that helps,
Pete

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The problem sounds like you have a feedback loop between the outputs and the input. Here's my suggestion:
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is it flashback or restorepoint with flashback?
Restore Points in Oracle10g Release2 [ID 330535.1] --> applicable for 11g too.
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http://docs.oracle.com/cd/B28359_01/server.111/b28294/rman.htm#CIHIAADC
http://www.idevelopment.info/data/Oracle/DBA_tips/Data_Guard/DG_53.shtml#Physical%20Standby%20Database%20Lags%20Far%20Behind%20the%20Primary%20Database
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