downgrade schema

Hi,
I have a server 2008 SBS domain and I would like to promote a member server running server 2008 R2 as a backup domain controller. I have run DC promo on the member server & it says the DC needs a schema upgrade. Basically I am nervous about altering the master controller schema in case it goes wrong (I have taken a full system state backup which was successful) but I am still nervous. My question is can I downgrade the member server schema to the same as the the DC, so I can add it as a backup domain controller without touching the DC.

Any help is greatly appreciated!
wifiitAsked:
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Cliff GaliherCommented:
Nope. If you want 2008 R2 to be a domain controller (there is no such thing as a "backup" domain controller in Active Directory, that was an NT4 and earlier concept) then you must update the schema.
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Mike KlineCommented:
As long as you have that good backup then that is your safety net so you should be good to go.  This schema update has been done thousands of times across many enterprises, it is a safe process but that backup is your insurance.


Thanks

Mike
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Brian PiercePhotographerCommented:
I agree 100% with @cgaliher.

The schema upgrade is a tried and tested process
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wifiitAuthor Commented:
Thanks guys for your help, could you confirm if the DC requires a restart after a schema upgrade?
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Mike KlineCommented:
It doesn't require a restart but we do all changes after hours.

Thanks

Mike
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wifiitAuthor Commented:
Thanks Mike, just 1 final question: do I need to set the second DC up as DNS server also? Or can I have only 1?
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Mike KlineCommented:
You can have two DNS servers and I encourage it for fault tolerance.

Thanks

Mike
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Windows Server 2008

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