Question : Adding a second Domain Controller

I'm interested in adding a second dc.  I understand the benefits to this, however if DC1 is used for DNS and the future DC2 needs this be promoted.   What could I expect if DC1 needs to come down for serviceing or failure.   What precautions must I take

Your opinions are greatly appreciated

Answer : Adding a second Domain Controller

With no Wins or DHCP, this really is quite straight forward.

If starting from a NT4 server, upgrade to W2k first,  make sure it can connect to DC1 , then run DCPromo.  Set up DNS as active directory-integrated on both boxes.  DC1, as the first DC in the domain is automatically a GC server.  If you lose DC1 and are unable to recover it, you just seize the FSMO roles on DC2 and designate it as the new GC.  Nothing very complex and no real pitfalls to avoid. If you need more detail about seizing FSMOs, see  "Flexible Single Master Operation Transfer and Seizure Process" at:    http://support.microsoft.com/?kbid=223787