Migrating to Windows 2012 R2 domain controllers - FRS to DFSR upgrade question

We currently have 2, 2008 R2 domain controllers and will be migrating to  2 - 2012 R2 domain controllers.  All four are currently online and have no issues, however it appears FRS is still in use as opposed to DFRS for sysvol replication.  I noticed it has been depreciated on 2012 R2.  Will this upgrade to DFSR once I remove the two 2008 R2 servers leaving the 2012 R2 or what issues will I have?
Fred BranhamSr. Network EngineerAsked:
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PberSolutions ArchitectCommented:
This will not migrate automatically.  This change can be done now even before you migrate them to 2012.  This technology change happened between 2003 and 2008.

See this article on how to do it.
https://technet.microsoft.com/en-us/library/dd640019%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396

Here's a nice blog entry as well.
http://blogs.technet.com/b/filecab/archive/2014/06/25/streamlined-migration-of-frs-to-dfsr-sysvol.aspx
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Fred BranhamSr. Network EngineerAuthor Commented:
Does it need completed before decommissioning the 2008 R2 servers, leaving only 2012 R2 DCs?  I guess i'm a bit confused as to how this works.  Seems to me that the current 2012 R2 DCs should NOT be working if FRS isn't supported.  Sysvol is shared and no replication issues are seen on any DCs.  Shouldn't I see replication/sysvol errors if 2012 R2 no longer supports FRS?
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PberSolutions ArchitectCommented:
I would do it now.  FRS is deprecating in 2008 as well.
Do you see a FRS service running on the 2012 servers?  I presume it is as you would have GPO issues for sure if you didn't have an intact sysvol.
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Fred BranhamSr. Network EngineerAuthor Commented:
Yes, I see it running.
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PberSolutions ArchitectCommented:
I would personally get rid of FRS now using the procedure above.   I don't think it would matter if you did it after, but it might make it cleaner when you are pure 2012.   The procedure is pretty straight forward.  Done it many times.
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Fred BranhamSr. Network EngineerAuthor Commented:
OK, Thanks for the info!
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PberSolutions ArchitectCommented:
No problem.
Glad to help.
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