R12 application tier install with shared appl_top for upgrade

This is only for people who would like to install R12 application tier with shared appl_top for application upgrade(11i to 12.1.x), and this is not for new system installation.
This is based on you are using NFS mount for your shared appl_top, you need to setup three mount points:
For other shared file system options, please see Steven Chan's blog
Choosing a Shared File System for Oracle E-Business Suite


1. local mount to hold your application $INST_TOP:
/apps/PROD

2. NFS mount for your shared appl_top, application $APPL_TOP, $COMMON_TOP, $ORACLE_HOME, $IAS_ORACLE_HOME:
/oracle/PROD

3. database(SAN mount) for your database:
/database/PROD

Steps:

1.       Click next

2.       Select “Upgrade to oracle Applications Release 12.1.1

3.       Click next

4.       Select  “Create Upgrade File System”

5.       Select  a port pool(the rule here are, if you choose pool 1, then the http port will be 8000+1, so http port is 8001, and database port is 1521+1, so the db port is 1522.)

6.       Fill in database information

      here, you database host is Primary, SID is PROD, the database $ORACLE_BASE is /database/PROD. Because this is an upgrade, so I assume that you already have this database installed with all your 11i data. (here I put my primary apps node and database node in the same server)

7.       fill in your apps password and Click next,

8.       Fill in Base directory, and instance directory, and click “Edit Services”. (here I put my primary apps node and database node in the same server)

       in the "Base directory" I put the direcotry under NFS mount, which will be your shared appl_top

       in the "Instance directory" I put my local mount, which will be your $INST_TOP for this node.

9.       Select services you want to run in this server.(This just an example here, usually in production instance, people may just want to put the "Batch processing services" into the same node as database, and leave all others to some low end servers(less CPUs). )

10.       Click “Add Server”

11.       Change the Host Name, and Check  “Shared file System”, and click the “Edit Services”

         in the "Instance directory" I put my local mount in apps1, which will be your $INST_TOP for this node.

12.       Disable both “Batch Processing Services” and “Other Services”

13. Repeat step 11-13 for other servers, and click “Next”

14.       Click “Next”

15.       Click “Next”

16.       when the installation finished, at the Linux window(not the Xwindow), you will see some lines like:

Configuration file written to: /apps/PROD/inst/apps/PROD_Primary/conf_PROD.txt

Copy this file to another directory, like somewhere under your NFS mount, here I copy it to /oracle/PROD/.  you will need it to configure other severs.

17.       start from this step, we will install apps on other servers.

        We may have to change the oraInventory on those apps servers,

   edit or create a file /etc/oraInst.loc

   put two lines in this oraInst.loc

     inventory_loc=/apps/oraInventory

     inst_group=dba

create a directory /apps/oraInventory

and chmod –R 777 /apps/oraInventory

start the installation

Click “next”

18.       select “Install Oracle Applications Release 12.1.1”

19.       click “next”

20.       select “Load the following saved configuration”, and put the file that we copied in step 17 in here. And click “next”

21.       click “next”

22.       click “next”

23.       repeat step 18 to 24 for all other servers.