How to specify different heap settings for Weblogic Admin Server and Managed Server

It is a general requirement in Dev/QA/PROD environments to have different heap size settings for Admin Server and Managed Server. The usual practice for server start up is as below:

1. Startup the Managed Server from command line
   $nohup ./startWeblogic.sh &
2. Start the Node Manager from command line
  $nohup ./startNodeManager.sh &
3. Start Manager server from Admin console.

Now if we don't specify separate start up parameters for Admin & Managed server, both start with same heap size settings and that is an over kill for Admin server which doesn't require huge heap.

So to set the heap size of the managed server which is managed by NodeManager do the following:

1. You can specify your start up parameters in the "Arguments" field in the console so that they are used when you start the Managed server through the admin console.

2. Modify the nodemanager.properties file and set the StartScriptEnabled value to false. Without this the managed server won't take the changed heap size into effect after restart. It will still taking the values set in setDomainenv.sh script (same as admin server).

3. Restart Node Manager and Managed server for the new parameters to take affect.