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Migrating from NT4 with multiple domains (3)

Posted on 2004-11-08
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Got a complete NT 4 setup, and want to go to 2003.  Multiple domains.  Basically, I'm looking for material to read up on for this process.  500 points will be split for advice.
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Question by:neowolf219
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by:Lee W, MVP
ID: 12524016
I've done this.  It's relatively simple.  I upgraded the "master" domain first - or at least the one I wanted to be the "master" domain (ie. mycompany.com), then I upgraded the other two domains afterward, only told them to be domains such as "ny.mycompany.com" and "la.mycompany.com" (Incidentally, I did this MONTHS apart).

Be aware that trusts in active directory become transitive - meaning that if DomainA trusts DomainB and DomainB trusts DomainC, then DomainA Trusts DomainC (this wasn't the case with NT4 domains).

It is recommended that you flatten you domain structure though - as this article points out, many of the reasons for having multiple domains disappear with active directory:
http://www.windowsitlibrary.com/Content/155/07/1.html
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by:neowolf219
ID: 12524071
When you upgrade each domain, what did you do.  I've heard alot about putting in a new NT4 BDC, upgrading it to PDC and then migrating.  Do you (or anyone) have articles from MS knowledgebase or deployment guides for the "gotchas" that are involved.

Thanks for the response.
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by:Lee W, MVP
ID: 12524153
From my experience, you upgrade the domains first deciding which will be the top level (mycompany.com), then any second level domain.  The procedure is the same as a single domain upgrade.  That is to say, you have to upgrade the PDC first.  However, what we did for the main domain was buy a new server, install NT4 on it as a bdc, promote it to PDC, then ran the upgrade to 2000.  Read through the article I posted.

(also, as I'm sure the article states, it's best to yank one BDC from the network prior to the upgrade.  Doing so will allow you to recover if there's a problem with the Active Directory Upgrade.

(How many users do you have?  Computers?)
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Lee W, MVP earned 2000 total points
ID: 12524238
More reading:

http://www.winntmag.com/Windows/Article/ArticleID/4692/4692.html
http://www.windowsitpro.com/WindowsMigration/Article/ArticleID/39527/39527.html
http://www.microsoft.com/windowsserver2003/technologies/directory/activedirectory/default.mspx

(And by the way, read alot - this is a MAJOR change to your network and no two paragraph answer here should really be considered sufficient to let you do an upgrade of this magnitude.
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