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Thread: ADPrep Adding 2008 R2 to a 2003 R2 Domain

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    Jay
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    ADPrep Adding 2008 R2 to a 2003 R2 Domain

    Has anyone here done this with a medium sized multi site domain? I have servers all over the world and as usual from Microsoft they have not made any improvement so just like 2000 to 2003 this command is a nasty one if it goes wrong.
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    Re: ADPrep Adding 2008 R2 to a 2003 R2 Domain

    Quote Originally Posted by Jay View Post
    Has anyone here done this with a medium sized multi site domain? I have servers all over the world and as usual from Microsoft they have not made any improvement so just like 2000 to 2003 this command is a nasty one if it goes wrong.
    I've done it in the past and didn't get hit by any gotchas.
    I used nslookup to do some DNS checks and DCDiag to do some AD checks, then took a backup before starting anything. I did the adprep on the schema master and IIRC I had to run it more than once with different switches each time to prepare the forest.
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    Jay
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    Re: ADPrep Adding 2008 R2 to a 2003 R2 Domain

    I have done the dcdiag tests and they come back fine and nslookups from all DC can resolve the master. Its a pain the Microsoft don't make this less painless, its a single command that can kill a domain.

    Did you take your master replication off to test after you had run the adprep /forestprep / domainprep?
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    Re: ADPrep Adding 2008 R2 to a 2003 R2 Domain

    Quote Originally Posted by Jay View Post
    Did you take your master replication off to test after you had run the adprep /forestprep / domainprep?
    If by this you mean completely disconnect the schema master from the rest of the network to perform the ADprep, then no. I tried it in a VM test environment using restored backups of all of the DC's in one site in an isolated network first. I can't remember how I checked that replication of the new schema had completed - I may have just used the AD schema manager on the important DC's to check for the new objects/attributes.
    I left the whole thing for 24 hours and checked the event logs on a sample of DC's before trying to add any 2008 R2 servers.
    IIRC if you try to add a 2008 R2 DC to a domain that needs the updated schema, it'll just prompt you anyway but don't take my word for it!
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    Jay
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    Re: ADPrep Adding 2008 R2 to a 2003 R2 Domain

    yes it will prompt you. You can check the Schema Revision attribute number is 5 that normally means it has worked.

    I am creating VM images of my local DCs etc but I have DCs all over the world so its going ot be hard to test those. Plus I have some child domians and some trusted domains as well.
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