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Can you raise functional level incrementally? RRS feed

  • Question

  • We're running at 2008 R2 FL on 2008 R2 DCs. We'd like to migrate to 2016 FL on 2019 DCs.


    Is it possible to add 2019 DCs, demote the 2008 DCs, then raise the FL incrementally 2008 R2 -> 2012 R2 -> 2016? Or does that require stepping up the server version as well? We're trying to do as few server migrations as possible.

    Thursday, July 11, 2019 6:06 PM

All replies

  • You can only raise DFL to the level of the lowest OS domain controller, but yes once the 2008 are gone (or demoted) you can raise DFL as needed. The requirements for introducing the first 2019 domain controller are domain functional level needs to be 2008 R2 or higher and sysvol replication needs to have been migrated from older FRS technology to DFSR
    https://techcommunity.microsoft.com/t5/Storage-at-Microsoft/Streamlined-Migration-of-FRS-to-DFSR-SYSVOL/ba-p/425405

     

    (please don't forget to mark helpful replies as answer)

     

     



    Regards, Dave Patrick ....
    Microsoft Certified Professional
    Microsoft MVP [Windows Server] Datacenter Management

    Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.






    Thursday, July 11, 2019 6:18 PM
  • To add, if you demote the 2008 DCs and leave them joined to the domain, they become member servers. Only the OS of DCs must be at least the same as the DFL. Member servers can remain at 2008 R2.

    Richard Mueller - MVP Enterprise Mobility (Identity and Access)

    Thursday, July 11, 2019 7:37 PM
  • Hi,
     
    Just want to confirm the current situations.
     
    Please feel free to let us know if you need further assistance.
     
    Best Regards,
    Lee 

    Just do it.

    Monday, July 15, 2019 9:57 AM
    Moderator
  • Hi,

     

    Was your issue resolved?

    If no, please reply and tell us the current situation in order to provide further help.

     

    Best Regards,

    Lee


    Just do it.

    Thursday, July 18, 2019 4:50 AM
    Moderator