Hi Sreekanthkalli,
The Upgrade usually starts with upgrading the sandbox system followed by development, quality, Mocks and finally real production server.
The activities to be performed for the Upgrade of production system comes under cut-over activities.
Broadly it has following activities -
1. System Refresh from production system to TEMP system.
2. Upgrade of TEMP system.
3. Running scans on TEMP system.
4. Create TWIN transport.
5. Running PREPARE on production system (Uptime activity)
6. Running Upgrade on production system (Till downtime phase MODPROFP_TRANS)
4. Business Ramp Down
8. Any other servers connected to production server has to be shutdown - This is also called as Isolation Phase.
9. Make sure that we have one successfull backup before downtime
10. Start the downtime activities and complete the Upgrade.
11. Post Upgrade tasks including Add-On Install and SGEN execution.
12. Prepare the system for Export. Import the TWIN TR from TEMP system
13. Install ECC on the new production hardware
14. Start Export-Import parallely.
15. When Import finished continue with sapinst including Central Instance Install.
16. Post Import ECC tasks
17. Install Application servers
18. Adapt the SAP and ORACLE profiles for the all the CI and DI
19. STMS and domain controller configuration
20. PtP activities including impot of various transports
21. Cluster testing and failover testing
22. Controlled Business Startup
23. Full Business startup
Except these also we used to build one more refrence system so that in case of fallbck we can use that system.
Please let me know if you need any more details.
Thanks,
Nitesh Jain
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