I manage a LAN comprised of 4 subnets. My company wants one of the subnets split out into another separate domain. Call the original domain, domain A and the new domain, domain B. Both current DCs are Win 2000. A and B will each get one of the two existing DCs (because of the way the split worked out). Two new DCs will be bought to add to A and B, so each will have two DCs, one old DC and one new DC. Domain B will need to have all its nodes moved over into a new domain (off of domain A) and the old DC brought over into the new domain. Domain A will need to have a second DC built for it.
I am struggling with the best to accomplish all this. I feel it is sound thinking to build a new DC for domain B, and move all the nodes over to the NEW domain B DC. I am not sure how best to handle the existing DC (Win2000) on domain B. It will have the old domain A Active Directory structure on it. Could I demote it back to a member server, move it to the new domain B, and then dcpromo it back to a DC on the new domain? Would this safely clear out the old AD database? Or would it be safer to rebuild the original DC as Server 2003 so both DCs would be on 2003?
I will also have to build a second DC for domain A. Its existing DC will have the FISMO roles. What all is involved in putting a Win 2003 DC on a domain that currently has a Win 2000 DC as the FISMOs.
I don't know enough about the differences in 2000 and 2003 to know what the "gotchas" are. Also I've never done anything quite like this before. All thoughts welcome.
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