How to split J2EE from sharing Oracle host?

We have NW Enterprise Portal 7.0 Ehp1 installed on a physical host where the Oracle Database is installed (Linux).  It's a very basic DB/J2EE installation.

Now, I want to move the J2EE to a VM Guest separate from the Oracle Database.  On the new VM guest, I will do the typical steps for moving to a new server:

1. Setup the <sid>adm account and the necessary group accounts, basically copying /etc/passwd & /etc/group.
2. Unmount the /usr/sap and /sapmnt files systems from the current server and mount them on the new.
3. Make sure the environment is setup with stuff like /etc/services and the like.

But then I'm challenged on how to make sure the Portal and the Database know where each other are located.  Anyone know the steps to do this kind of split?

Thanks!