Fsmo roles with 2003 and 2008 r2 DC

Hey Expert,
I would like too know more about FSMO. I have a 2003 DC that have the 5 fsmo role, and I just addint a 2008 R2 DC, should I move my 5 fsmo role to the new DC 2008 or not and why?

tks again
pcreteAsked:
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Mike KlineCommented:
It will work fine on the 2003 box but I'm guessing at some point you are planning to remove the 2003 DC and only have 2008 R2 DCs so I'd probably transfer them...but again things will run fine with the FSMOs on the 2003 box.

If you transfer them to the 2008 box and are currently pointing your 2003 box/PDCe to an external time source then do that on the 2008 R2 box.

Thanks

Mike
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Dangle79Commented:
While you're still in mixed mode it really doesn't benefit you any to move to the 2008 box, except of course that it's probably newer/faster, because your functional level will still be at 2003.

Ideally you wouldn't be running all five on the same box for performance sake anyway. Here is the MS guidelines for FSMO placement. http://support.microsoft.com/kb/223346
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Mike KlineCommented:
With the vast majority of today's hardware putting them all on one box is going to be ok.    Some of the performance KBs are dealing with recommendations from 10-12 years ago.
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sivanovCommented:
it would help if you share some more info about your plans for infrastrucure changes. For example do you plan to place exchange server 2010, what would be the majority of the clients. I expect that you add the Win2008r2 DC with purpose :-). If you plan to remove the old DC 2003 please do it like it should be done.

Cheers
Svet.
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pcreteAuthor Commented:
Super tks alot for the info,
Could I put the Schema and the Domain Naming on the 2008 and leave the other on the 2003...
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Mike KlineCommented:
You can do that, putting the forest wide roles there.
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pcreteAuthor Commented:
I Install the 2008 R2 because we had a licence  and would like to see the new interface :)-
No I do not have exchange here I had 2003 last year and know we use Office 365
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Leon FesterSenior Solutions ArchitectCommented:
You need to move the PDCe role to the Windows 2008 DC as well or you will find that some groups are missing.

Question
Is it ok to have FSMO roles running on a mixture of operating systems? For example, a PDC Emulator on Windows Server 2003 and a Schema Master on Windows Server 2008?

Answer
Yes, it’s generally ok. The main issue people typically run into is that the PDCE is used to create special groups by certain components and if the PDC is not at that component’s OS level, the groups will not be created.

For example, these groups will not get created until the PDCE role moves to a Win2008 or later DC:

http://blogs.technet.com/b/askds/archive/2010/08/13/friday-mail-sack-mostly-edge-case-edition.aspx#fsmo

If these groups are not created properly then you'll not be able to use some of the 2008 specific functionality.

FSMO roles placement recommendation is that the roles are held on the server with the best hard. It's in the link http://support.microsoft.com/kb/223346

I agree with the general rule of splitting FSMO roles, but if you're a small organization then it's not always practical or neccessary. The idea of splitting FSMO roles is to spread the load/amount of work performed by each server. Of the 5 FSMO roles, the PDCe is the most critical.
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Windows Server 2008

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