Adding a new Domain Controller to existing Domain

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Adding a new Domain Controller to existing Domain
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ANSWER:

It does not matter. Since it saves time to DCPromo directly, do that.

MINOR CAVEAT: The SID of the Server 2008 install should be different than any of the existing machines. If you didn’t clone this from another install (as in a virtualized environment), then you should be fine.

by Joel from http://serverfault.com/questions/382353