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What impact will demoting Domain Controllers have? Is there a way to test?

Last Modified: 2015-04-18
For some reason there are 6 domain controllers at 1 site. I don't see the need for them and would like to do some clean up tasks.

There are:
4 x 2008 R2 DC's (which one of them is the PDC)
2 x 2003 DC's.

I only want to keep 2 of the 2008 R2 DC's.

Are far as I can see the domain functional level etc is at 2008 R2 level, so just wondering if there would be any other potential impacts by demoting these DC's back to member servers?

It's not causing us chaos or anything, just the odd GP delay. Demoting & promoting is just one of things you only have to do once every few years, so I never remember the important details :)
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