Windows Server 2008 /adprep on a Windows Server 2000 DC

vcio
vcio used Ask the Experts™
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I am looking for confirmation of the following step in the related solution:

"Since you are upgrading the Operating System on the new Domain Controller, you will need to add some values to the existing Active Directory schema, in order for the new server to become a Domain Controller. Windows Server 2008 supports more functionality than before, so a schema upgrade for the domain and forest is required to facilitate this and make this new feature set fully functional on the domain. To make the necessary changes, you must be logged on as the built-in Administrator user account, or a user with Domain, Schema and Enterprise Admin privileges.

Insert the Windows Server 2008 media into your current server . Open a command prompt and browse to sources\adprep folder within the Windows Server 2008 DVD media. Execute the command adprep /forestprep."

Will this command work on a Windows 2000 server? I was under the impression that you could not upgrade directly from Server 2000 to Server 2008. Which I guess is not what is technically being done here. Anyway, just cautious.
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Head of ICT
Top Expert 2009
Commented:
Hi there,

adprep is basically extending the AD schema to allow new objects/attributes in the database. Before you can promote a 2008 box to  DC you will need to do this.

There is no problem with running this on a 2000 domain. And you are right, this isn't the same as upgrading a server from 2000 to 2008.

Have a read of this: http://www.petri.co.il/windows-server-2008-adprep.htm

This explains what you need to do.

Tony
Justin OwensITIL Problem Manager

Commented:
You are not upgrading your server, but your AD schema.  Adding a 2008 server into an AD 2000 scenario is supported.  Remember, that if it is the first 2008 DC, you must also run "adprep /domainprep" and "adprep /gpprep" on the Windows 2000 Server DC (the DC that holds the infrastructure master).
This site has good information on adding a 2008 DC into a 2000 AD: http://technet.microsoft.com/en-us/library/cc771433(WS.10).aspx
Justin

Author

Commented:
In the referenced question and accepted solution they only mention executing
- adprep /forestprep
- adprep /domainprep

but not grpprep.

Can anyone expand on this? Is it optional?
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bluntTonyHead of ICT
Top Expert 2009

Commented:
Use of the gpprep switch is required in your case as you are upgrading from 2000.

Follow the steps in the article I linked. The gpprep switch is used at the end to allow RSoP planning mode within the GPMC (a tool used to determine resultant group policies for specified machines/users).

Tony

Author

Commented:
Sorry for not seeing that in your link. I trusted the search function in the browser. Scrolling down I can see what you are referencing.

Author

Commented:
Before I close this question, can you give me a swag at how long it will take to do this?
bluntTonyHead of ICT
Top Expert 2009

Commented:
No more than a few minutes really for the process to complete, but you need to allow for replication between each step.

If you're in a single site/single domain, then replication will also be only a minute or so. If you have multiple sites, then this will be governed by the replication interval on your sitelinks, although you can force replication in AD Sites and Services.

Tony

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