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Exchange 2010 with two Active Directory Controllers

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  • Exchange 2010 with two Active Directory Controllers

    I have my two ADS, both are global catalogs. Both have DNS on them. Both are replicating correctly. My issue is that when PDC (AD1) fails exchange stops working correctly and doesnt failed to the secondary AD2. Can anyone advice what I did wrong here.

  • #2
    Re: Exchange 2010 with two Active Directory Controllers

    Exchange relies heavily on the Infrstructure Master FSMO role, which is only held by 1 DC at a time. When that DC goes down, Exchange is unhappy.

    Read up on FSMO roles, then look at how your roles are divided up.
    *RicklesP*
    MSCA (2003/XP), Security+, CCNA

    ** Remember: credit where credit is due, and reputation points as appropriate **

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    • #3
      Re: Exchange 2010 with two Active Directory Controllers

      The 2nd domain controller needs to be a global catalog server.
      Don't forget to say thanks by giving "Kudos" to those that help solve your problems.

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      • #4
        Re: Exchange 2010 with two Active Directory Controllers

        Originally posted by _TechSup1983 View Post
        The 2nd domain controller needs to be a global catalog server.
        Second Controller is also GC.

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        • #5
          Re: Exchange 2010 with two Active Directory Controllers

          Originally posted by RicklesP View Post
          Exchange relies heavily on the Infrstructure Master FSMO role, which is only held by 1 DC at a time. When that DC goes down, Exchange is unhappy.

          Read up on FSMO roles, then look at how your roles are divided up.
          So theres no way to have failover active directory for Exchange?

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          • #6
            Re: Exchange 2010 with two Active Directory Controllers

            It should work, but can cause issues
            You may want to review this post regarding topology discovery and see if it helps:
            http://social.technet.microsoft.com/...m=exchange2010


            Moving thread to Exchange forum for better response
            Tom Jones
            MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
            PhD, MSc, FIAP, MIITT
            IT Trainer / Consultant
            Ossian Ltd
            Scotland

            ** Remember to give credit where credit is due and leave reputation points where appropriate **

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            • #7
              Re: Exchange 2010 with two Active Directory Controllers

              Exchange will only use one domain controller at a time.
              If that domain controller goes away, it doesn't go looking for another one immediately. It should do in around 15 minutes, but in reality that is normally more like 45 minutes. In that time Exchange is dead in the water.

              Restarting the system attendant service should force Exchange to look for another domain controller with the GC role and it will then start working correctly.

              Although if you have a domain controller failing then you have bigger problems to worry about!

              Simon.
              --
              Simon Butler
              Exchange MVP

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