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Migrate windows 2000 DC to windows 2008

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Migrate windows 2000 DC to windows 2008

Postby chicagotech » Sat Mar 22, 2008 11:51 am

Is it possible to perform a merge upgrade from a 2000 domain to 2008? I would be installing the win2008 servers on new machines, promoting them to DC's transferring the roles and decomissioning the older w2k servers. I know its a supported upgrade path from 2003 to 2008 but wanted to ensure it was possible from 2000 to 2008 without having to first upgarde the domain to 2003.

Thanks

- Here is what you need to do.




install Windows 2008 x64 to x64 hardware

apply schema update to Windows 2003 AD

join to Windows 2000/2003 domain

promote Windows 2008 x64 to DC

ensure replication has completed

move FSMO roles

decommission Windows 2000/2003 DC’s



There is a schema update required before you can add a Windows 2008 DC to a Windows 2003 or 2000 domain.

http://technet2.microsoft.com/windowsse ... x?mfr=true



Here is the starting point for assistance in upgrading AD - http://technet2.microsoft.com/windowsse ... x?mfr=true



tgc
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Postby chicagotech » Fri Sep 19, 2008 3:21 pm

Before you install Windows Server 2008, the first thing is to check system
requirement. The requirement differs from the versions of the system.
Please read the important information and known issues before installation.

I understand that you are going to add a new AD to the forest. Because the
forest is Windows 2003 R2, you will need to upgrade the forest using the
following procedure.
If you are performing an unattended installation, perform this step before
you install the operating system. Otherwise, you will need to do this after
you run Setup and before you install Active Directory Domain Services.
To prepare a forest:
1. Log on to the schema master as a member of the Enterprise Admins, Schema
Admins, or Domain Admins group.
2. Copy the contents of the \sources\adprep folder from the Windows Server
2008 installation DVD to the schema master role holder.
3. Open a Command Prompt window, navigate to the Adprep folder, and run
adprep /forestprep.
4. If you plan to install a read-only domain controller (RODC), run adprep
/rodcprep.
5. Allow the operation to complete and the changes to replicate before
following the next procedure.

Because this is a new domain in the forest, it is not necessary to prepare
the domain for the other domains. However, You must make domain functional
level decisions that determine whether your domain can contain domain
controllers that run Windows 2000 Server, Windows Server 2003, or both.


Please kindly refer to the following articles for more information:
Installing Windows Server 2008
http://download.microsoft.com/download/ ... 4a-dace88e
99456/readme.htm

"Scenarios for Installing AD DS"
http://technet.microsoft.com/en-us/libr ... omainScena
rio

"Step-by-Step Guide for Windows Server 2008 Active Directory Domain
Services Installation and Removal"
http://technet.microsoft.com/en-us/libr ... 55258.aspx
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Re: Migrate windows 2000 DC to windows 2008

Postby blin » Tue Nov 01, 2011 10:59 am

Migrating a Windows Server 2003 Active Directory environment to Windows Server 2008 can be done in three distinct ways:

In-place upgrading
Windows Server 2003 and Windows Server 2003 R2 can both be upgraded in-place to Windows Server 2008, as long as you keep the following in mind:

The Windows Server 2003 patchlevel should be at least Service Pack 1
You can't upgrade across architectures (x86, x64 & Itanium)
Standard Edition can be upgraded to both Standard and Enterprise Edition
Enterprise Edition can be upgraded to Enterprise Edition only
Datacenter Edition can be upgraded to Datacenter Edition only
This might be your preferred option when:

Your Active Directory Domain Controllers can still last three to five years (economically and technically)
You worked hard to get your Active Directory in the shape it's in.
Your servers are in tip-top shape.
Transitioning
Migrating this way means adding Windows Server 2008 Domain Controllers to your existing Active Directory environment. After successfully moving the Flexible Single Master Operations (FSMO) roles you can simply demote the previous Domain Controllers, remove them from the domain and throw them out of the window. Transitioning is possible for Active Directory environments which domain functional level is at least Windows 2000 Native.

I feel transitioning is the middle road between the two other ways to migrate to Windows Server 2008:

Restructuring means filling a new Active Directory from scratch
In-place upgrading means you're stuck with the same hardware and limited to certain upgrade paths
Transitioning means you get to keep your current Active Directory lay-out, contents, group policies and schema. Transitioning also means moving to new machines, which can be dimensioned to last another three to five years without trouble.
Transitioning is good when:

You worked hard to get your Active Directory in the shape it's in.
Your servers are faced with aging.
In-place upgrading leaves you with an undesired outcome (for instance 32bit DC's)
You need a chance to place your Active Directory files on different partitions/volumes.
When done right your colleagues might not even suspect a thing! The downside is you need to know exactly what you're doing, because things can go wrong pretty fast. that's why I wrote this useful piece of information.

Restructuring
A third way to go from Windows Server 2003 Domain Controllers to Windows Server 2008 Domain Controllers is restructuring your Active Directory environment. This involves moving all your resources from one (Windows Server 2003) domain to a new and fresh (Windows Server 2008) domain. Tools like the Active Directory Migration Tool (ADMT) are priceless in these kind of migrations.

Restructuring is good when:

Your current Active Directory environment is a mess or is uncontrolable
You want to build a new Active Directory environment and import (pieces of) your existing Active Directory environment.
You need to merge (information from)(domains from) two Active Directory forests together
You need to split (information from)(domains from) two Active Directory forests
Note:

ADMT v3.1 with support for Windows Server 2008 has not been released yet.
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