Thanks for looking into my query
Sorry I am a newbie in jboss cluster setup.
But is there way to manually deploy exploded ear? or that is also not supported?
Lets explain this first: clustering and domain mode are independent. So you don't have to use domain mode to use clustering and vice versa.
If you want to use clustering and you have to use exploded archives, you can use standalone HA profiles and start both servers like this:
./bin/standalone.sh -c standalone-ha.xml
In this case you need to configure them both separately (including the deployments).
in addition to Radoslav's explanation.
You might think about 'standalone' mode as a similar mode to former AS versions, each server is configured and started separate. You can deploy an application by drop it into the standalone/deployment folder as you did it in AS5.
Also you might deploy files using the CLI (command line interface) but here you deploy only files.
You might configure one or more nodes as a cluster member using the standalone*-ha.xml profile (i.e. start the server with --server-config=standalone-ha.xml)
The domain mode is only a way to have a single point of configuration. You are able to configure 'all' server-nodes in one place and have a monitoring if a server crash. See documentation for more details.