MSI Mode

[raja]

Hi Erman

Congrats for becoming an ACE now.

Do you think, MSI mode will work if the EBS applications are not shared?

If no, then what type of shared application tier it should be? NFS, ACFS etc

[ErmanArslansOracleBlog]

Thanks.
I think yes.
Ref: EBS 12.2 Service Startup On Secondary Node Fails When Primary Node is Down (Doc ID 2052792.1)

[raja]

Thanks Erman. I have a doubt.

1. Say i have two application nodes(app1 and app2) and it is not a shared application tier without any load balancer.

Now app1 has web services,forms services as enabled services and app2 has web services, forms services and conc services. When both both the nodes are up, will my EBS have two different url?

<a href="http://app1hostname.domainname:port">http://app1hostname.domainname:port and <a href="http://app2hostname.domainname:port">http://app2hostname.domainname:port
Am i correct?

2. I understand that admin server runs only in primary node(in EBS 12.2) and when we want to start the services of slave nodes(in case of primary crashes), i have to use the MSI option to start the ebs services. In this case how the manage servers which are deployed under admin servers will start in slave nodes. And also if the admin server is down, will my EBS 12.2 login work?

Please make me understand

[ErmanArslansOracleBlog]

1) Yes.. You may use load balancer to load balance your work to these Web tiers.
2) There is no such thing called "managed servers which are deployed under admin server" and yes, you can login to EBS. (as long as your EBS managed servers like oacore are working on your surviving nodes and as long as you have a load balancer redirecting the client requests to the surviving node/nodes.. If you don't have a load balancer, then you need to use the links that is defined for the Webtier in the surviving node/nodes)

[raja]

Thanks So much. So in a typical EBS 12.2 installation for non shared multinode apps tier, admin server runs only in primary and manage servers runs in all the apps nodes, correct? And when the admin server is down and if we are using MSI option then Manage servers works with its own local copy, correct?

[ErmanArslansOracleBlog]

correct. when primary node is down, Managed Servers on your secondary node will still be running if you are not using a shared FS and ofcourse if you have managed servers for your secondary node.
If you are using shared fs, when your primary is down, this means -> your secondary node's managed servers are also down and you start them using msimode. Msimode makes your managed servers be up without requiring the Admin server to be up.