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Question about migrating DCs from 2003 to 2012
My question is at the end of this post, I just want to describe the situation leading into it first.
I need to migrate two 2003 Server based domain controllers to 2012 R2 DCs. The 2003 DCs are ...
Since you have multiple DCs I'd use dcdiag / repadmin tools to verify health and correct any errors before moving on. Then also make the new ones GC (recommended), transfer FSMO roles over, transfer pdc emulator role to one of the new ones, use dcdiag / repadmin tools again to verify health, when all is good you can decommission / demote old ones. You can check demotion was clean / successful.