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ShakkeerChalakkandi-5006 avatar image
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ShakkeerChalakkandi-5006 asked ShakkeerChalakkandi-5006 commented

Domain Controller - 2016 and 2019

Hello Guys,

I have 2016 DC and ADC, few days ago one of the DC crashed and I cleaned up metadata and removed crashed DC entries completely, and seized all roles. Now running with one DC- Server 2016.

I am planning to build a secondary as dc 2019, would it be a problem to have two Dc's with different versions of OS 2016 and 2019.

Also, would there be any issue with the replication as current DC 2016 using FRS replication?

windows-active-directory
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1 Answer

TerenceQiu-MSFT avatar image
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TerenceQiu-MSFT answered ShakkeerChalakkandi-5006 commented

Hello,
Welcome to ask here!


The DC2016 and 2019 can act as domain controllers at the same time in the domain.


The minimum requirements to add a Windows Server 2019 Domain Controller is :
Windows Server 2008 functional level or higher.
Use DFS-R as the engine to replicate SYSVOL.
If you want to check if the DFSR is used for the Sysvol replication, the following command can be used:
Command:
dfsrmig.exe /getglobalstate
If the Result: 3 (ELIMINATED) the DFSR is used for the replication.
If not, FRS should be migrated to DFSR:
https://docs.microsoft.com/en-us/windows-server/storage/dfs-replication/migrate-sysvol-to-dfsr


Before Migrate the FRS TO DFSR, make sure the functional level is 2008 or higher.
To raise the forest functional level
Open Active Directory Domains and Trusts. To open Active Directory Domains and Trusts, click Start, click Administrative Tools, and then click Active Directory Domains and Trusts.
In the console tree, right-click Active Directory Domains and Trusts, and then click Raise Forest Functional Level.
In Select an available forest functional level, select the value and then click Raise.


Then before adding the new dc, we should also make sure everything is working well, following command for your reference:
Dcdiag /v >c:\dcdiag1.log
Repadmin /showrepl >C:\repl.txt
Repadmin /showrepl *
Last, the new DC can be added, following for your reference:
https://www.petenetlive.com/KB/Article/0001262(third-party link)


This response contains a third-party link. We provide this link for easy reference. Microsoft cannot guarantee the validity of any information and content in this link.


Best Regards,

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Thank you, explained well. since I have only one DC output of the following command would be an error

Repadmin /showrepl >C:\repl.txt
Repadmin /showrepl *

I had two Dc's one of them crashed so the new domain going to be server 2019.

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  • Metadata Cleanup completed for crashed DC


  • Removed all the DNS entries of crashed DC

  • FRS to DFRS migration completed - I choose Quick Migration since I am sure about my domain controller is healthy, I want a rollback option

  • Configured new DC as 2019 server

  • Tested Replication and DC health


All okay now, thank you.



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