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MIgrate Windows 2003 DC

Posted on 2008-06-11
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Last Modified: 2012-05-05
Hi,
I have 3 DCs (Windows 2003 enterprise SP1), one of them is currently running of diskspace.  Since this one is a 5 years old server.  I want to buy a new server and migrate this existing one the new one.  The existing one is currently a DC which is also holding a secondary WIN.  What is the best way to handle this migration which won't create any downtime, and also how to find out whether this existing DC holding another other roles in addition to DC and secondary WIN.  
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Question by:NickQ
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Joseph Hornsey earned 500 total points
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Nick,

To answer your last question first, here's how you find out who holds the roles:

1. Open Active Directory Users & Computers
2. Right-click on the domain and go to "Operations Masters"
      - Here you will find tabs for the RID Master, PDC Emulator and Infrastructure Master
3. Open Active Directory Domains & Trusts
4. Right-click on the root and go to "Operations Master"
      - Here you will find the Domain Naming Master
5. Click on Start | Run and type "regsvr32 schmgmt.dll" and hit ENTER.  Hit OK when the box comes up telling you it's registered.
6. Click on Start | Run and type "mmc" (no quotes) and hit ENTER
7. Add the Active Directory Schema snap-in to the console
8. Right-click on Active Directory Schema and go to "Operations Master"
     - Here you will find the Schema Master

Regarding migrating your Domain Controller, just do this:

1. Get the new server and make it a member of the domain.  Install DNS on it.
2. Click on Start | Run and type "dcpromo" and hit ENTER.
3. Go through the promotion process and have it automatically configure DNS.
4. Point your clients (via DHCP or manually) to the new DC for DNS.
5. Run dcpromo on the existing DC and demote it.

That's a little oversimplified, but pretty much covers you.

Does that help?

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by:Joseph Hornsey
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Oh, yeah.  And get rid of WINS unless you have some reason why you need it.  Windows networks haven't needed it since NT 4.0.

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by:NickQ
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Thanks for your speedy repsonse.  I already have one DC which already holding a DNS.  For this new server, it is nice to have a secondary DNS as the backup to the primary one.  So buying a new server, build it, make it member of the domain, using dcpromo to make it DC, and how to to make it as a secondary DNS server to first one?  Yes, I will ignore the WIN.
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by:Joseph Hornsey
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Well, the easiest way to handle DNS is to do this:

1. Make sure your DNS zone is Active-Directory Integrated.  This means that all of the DNS info is stored in AD instead of in flat text files on the local HDD.  Also, this means that all DNS info is replicated to all domain controllers.
2. Before you promote the new DC, install the DNS Server service.
3. When you promote the new DC, it will automatically see the DNS info in AD and will use it for DNS.  No need to do anything at all.

To get your clients configured, just add the other DC as a Secondary DNS Server in their TCP/IP settings either manually or via DHCP.

Hope that helps!

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by:NickQ
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Thanks so much
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by:Joseph Hornsey
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You're very welcome!

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