Forum Discussion
WIN Server 2008R2 Migration
Hello Everyone, We have 4 DC in a domain, replicating each other, 2 of them are 2008R2 and 2 are 2012R2, i want to upgrade/Migrate 2008R2 to 2012R2, My question is, after migration and upgrade, whe...
Do not in-place upgrade them. I'd use dcdiag / repadmin tools to verify health correcting all errors found before starting. Then stand up the new 2012 R2, patch it fully, license it, join existing domain, add active directory domain services, promote it also making it a GC (recommended), transfer FSMO roles over (optional), transfer pdc emulator role (optional), use dcdiag / repadmin tools to again verify health, when all is good you can decommission / demote old one, and move on to next one.
Also at some point either before or after I'd recommend migrating sysvol replication from older FRS technology to DFSR
https://techcommunity.microsoft.com/t5/Storage-at-Microsoft/Streamlined-Migration-of-FRS-to-DFSR-SYSVOL/ba-p/425405