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Upgrading from an NT 4.0 domain

By It's Not Easy Being Green ·
Once you create an AD Forest, can you migrate in an old NT4 domain to your existing structure? ie: Corperate takeovers, mergers etc...

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Upgrading from an NT 4.0 domain

by timwalsh In reply to Upgrading from an NT 4.0 ...

The short answer is yes, but it's not necessarily a simple arrangement depending on what you want your final domain architecture to look like. Will you be migrating the old NT4 domains to Win2K or maintaining them as NT4 domains?
If you will be maintaining NT4 domains, then connecting to your existing structure will take place through the use of trust relationships between the various domains. Be advised that trust relationships between an NT4 domain and a Win2K domain work just like the pure NT4 trusts - i.e. they are one-way and none-transitive.
If you will be transitiioning to Win2K, your options greatly increase. You can make the added domains seperate trees under your present forest and still have the added domains maintain their old domain names (if that is an important consideration).
You can also roll up the added domains and move their resources into present trees or child domains in your present forest.
Would suggest getting a good book on AD if this is the route you will take.

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Upgrading from an NT 4.0 domain

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Upgrading from an NT 4.0 domain

by Sojournist In reply to Upgrading from an NT 4.0 ...

Yes.

Migration of the NT domain into the 2k Forest can take two forms:

UPGRADE
o Takes less lead time so can be completed more quickly
o Costs less up front, but cost over time can actually make it more expensive
o Riskier migration strategy. In most circumstances requires an all-at-once approach.
o Much more radical rollback process (Can we say tape backup?) The "BDC-in-a-Closet" trick can help minimize the risk and downtime.

RESTRUCTURE
o More planning time needed.
o Front-end costs are more
o Allows for cleaner domain and AD design for larger multi-domain networks
o More graceful rollback opportunities
o Allows incremental migration of accounts and computers
o "Copy and Paste" of user accounts possible
o Allows users and computers to exist in parallel environments

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Upgrading from an NT 4.0 domain

by Sojournist In reply to Upgrading from an NT 4.0 ...

If it is for a merger or aquisition you can stand up the new domain with independent namespace by installing the migrated domain as the root of a new tree in an existing forest.

In the meantime the NT domain can be connected with one-way non-transitive trusts to the other domains in the forest, allowing for limited participation in the forest.

To get all the details, find a Microsoft Certified Technical Education Center in your area and ask for the two-day course 2010. It will enumerate all of the techniques, tools and planning involved in the migration of an NT domain into an existing 2k forest.

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Upgrading from an NT 4.0 domain

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Upgrading from an NT 4.0 domain

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