Step back : WLS 8.1 SP2

I couldn't post for a while .....cause i was busy in upgrading 10g Fusion Middleware platform from RHEL3 to RHEL5. As part of the platform migration/upgrade,I did Coreid Access and Identity Management Upgrade from 7.0.4.3 to 10.1.4.3 and OS migration for 10gAS (10.1.2.0.2) OID, SSO and Portal components, since RHEL 3 is reaching EOL this year. This is part of the 11g Fusion Middleware Upgrade Preparation.

I will post the steps for 10g AS, RHEL 3 to RHEL 5 platform migration later.

I got an opportunity to work on WLS 8.1 SP2 upgrade. So,I would like to take a step back and discuss WLS 8.1 concepts for sometime.