What are the steps to Upgrade EBS 11.5.10.2 (RDBMS : 11.2.0.2) to EBS 12.1

Hi,
We plan to Upgrade from EBS 11.5.10.2 to EBS 12.1 (Last Release)
Our architecture :
- 2 Nodes Application Tiers : Apache + Forms
- 2 Nodes Application Tiers : Concurrent Managers + Reports
-> Those Nodes are on Linux RedHat 5.5 - Shared APPL_TOP
- 1 Node DbTier 11.2.0.2 on HP-UX Itanium 11
What are the Pre-requisits , Best Practices , White Papers , Step by Steps ... to accomplish this Upgrade ?
Regards,

This was discussed many times in the forum before, please see old threads for details -- https://forums.oracle.com/forums/search.jspa?threadID=&q=Upgrade+11i+to+R12&objID=c3&dateRange=all&userID=&numResults=15&rankBy=10001
Thanks,
Hussein

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