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Iron Contributor

Dec 27, 2020

DNS order in Active Directory Server

We have 6 server active directory - 3 server in DC : DC1,DC2,DC3 - 3 server in DR : DR1,DR2,DR3 - ALL server the same site in active directory (Default first Site) - DC1 : hold FSM...

Active Directory

Iron Contributor

Dec 29, 2020

Tien Ngo ThanhSo should all dc point to Primary : DC1 ? because it hold FSMO .

Dave Patrick
MVP
Dec 29, 2020
If they're all in the same site it really doesn't matter.
- Tien Ngo Thanh
  Iron Contributor
  Dec 30, 2020
  Dave PatrickIf change FSMO to another server then need change dns client point to this server hold FSMO ? and what's happen if DC1 failure then all server point dns first to DC1 has problem ?
  - Dave Patrick
    MVP
    Dec 30, 2020
    
    If change FSMO to another server then need change dns client point to this server hold FSMO ?
    
    No, this is not necessary. Intrasite DNS replication occurs within 15 seconds, 15 minutes max.
    
    and what's happen if DC1 failure then all server point dns first to DC1 has problem ?
    
    If the FSMO role holder fails then you can seize roles to another healthy one
    
    Transfer or seize FSMO roles - Windows Server | Microsoft Docs
    
    then perform cleanup
    
    https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-metadata-cleanup
    
    https://techcommunity.microsoft.com/t5/itops-talk-blog/step-by-step-manually-removing-a-domain-controller-server/ba-p/280564
    
    then rebuild the failed one.

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