Upgrading SCCM 2012 SP1 Secondary site server to SCCM 2012 R2

1.    SCCM secondary server need to be upgraded from SCCM console by going \Administration\Overview\Site Configuration\Sites
2.    Select the secondary site then click on upgrade on the Ribbon

3.    We can monitor the upgrade process by clicking on Show install Status
4.    The Install status window will start checking the prerequisites;

5.    Will continue by ConfigMgr Setup - Upgrading ConfigMgr Secondary site...

6.    Will upgrade the ConfigMgr database

7.    Data replication of secondary site server data from primary site server

8. Finally we will get ConfigMgr Setup – Upgrading ConfigMgr secondary site successfully.