Two node installation with 2 concurrent managers..

Need your help. I have 12.1.1 Two node installation on Linux 5.9 with 64 bit.
Linux2- Database server + Concurrent manager
Linux1- Apps Node
Port - 8002 (port pool -2)
on my app node - linux1, I have 2 directories <SID>_linux1 and <SID>_linux2. First one is for primary apps node and second one is for 2nd concurrent manager. It is a shared directory structure. I have 2 questions:
1) If I run the autoconfig on Linux1, I can run all the services and connect to apache. However, If I run the autconfig on linux2, I will not be able to connect to web server (for a short time request will be sent to Linux1 and then it gets forwarded to Linux2 - even though Linux2 is not app server).
2) How do I run the second concurrent manager on LInux2? After I run the 2 concurrent manager, how do I test both concurrent managers are working?
Your help is much appreciated.

Hi Hussein,
Thank you for the info. I was wondering whether the Linux2 concurrent manager was installed correctly or not. I went to xml file and found these entries and it made me think, it didn't install correctly because only concurrent manager should have been yes and the rest should be no. Isn't it? If it is wrong, how do I correct this?
<oa_system_config>
         <TIER_DB oa_var="s_isDB">NO</TIER_DB>
         <TIER_ADMIN oa_var="s_isAdmin">YES</TIER_ADMIN>
         <TIER_WEB oa_var="s_isWeb">YES</TIER_WEB>
         <TIER_FORMS oa_var="s_isForms">YES</TIER_FORMS>
         <TIER_NODE oa_var="s_isConc">YES</TIER_NODE>
         <TIER_FORMSDEV oa_var="s_isFormsDev">YES</TIER_FORMSDEV>
         <TIER_NODEDEV oa_var="s_isConcDev">YES</TIER_NODEDEV>
         <TIER_WEBDEV oa_var="s_isWebDev">YES</TIER_WEBDEV>
         <config_option type="techstack" oa_var="s_techstack">as1013</config_option>
         <config_option type="techstack" oa_var="s_tnsmode">generateTNS</config_option>
         <config_option type="adx" oa_var="s_apps_version">12.1.1</config_option>
         <config_option type="techstack" oa_var="s_apache_mode">NORMAL</config_option>
         <ias_version oa_var="s_ias_version">10.1.3.4.0</ias_version>
      </oa_system_config>

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if you find my contribution useful or “Mark As Answer” if it does answer your question. That will encourage me - and others - to take time out to help you.

Hi Simon,
Thanks for your response.
I have done some study, testing and what I figured out is this.
Split brain syndrome is prevented by always requiring a majority of the DAG members (and in the case of DAGs with an even number of member, the DAG witness server) to be available and interacting for the DAG to be operational.
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Satyajit
Please “Vote As Helpful”
if you find my contribution useful or “Mark As Answer” if it does answer your question. That will encourage me - and others - to take time out to help you.

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