Removing a 2003 DC and replacing it with 2008R2 DC

hi all. 
i have been doing a lot of reading and think i know the correct process, i just wanted to double check with the community.
we have 2 DC's in our environment DC1 and DC2 
DC1 is 2008r2 and hosts ADDS/DNS/DHCP/GC and all FSMO roles
DC2 is 2003 and hosts ADDS/DNS/GC and is there for redundancy
DC2 is a bit on the old side and i would like to remove it and replace it with a newer 2008r2 DC, from what i have read it seems the best process for this would be to run DCPROMO from DC2 and demote it and remove then promote a new server
DC3 is the server in waiting so running DCPROMO to promote it to a DC and allow replication to do its stuff and job done.
are there any steps that i am missing?
cheers
Gordon

Hello,
I wouldn't care with the naming/numbering. So run dcpromo for DC3, make it DNS/GC and if this machine has complete replicated an you have checked everything with the support tools start with demoting DC2.
That way you still have redundancy and can check BEFORE removing the old DC.
Assure that the new machine has also the SYSVOL/NETLOGON share after promotion. I recommend that you use ONLY DC1 as DNS server on the NIC from DC3 and NONE else. Later on you can change the DNS server settings.
The support tools can be used to create output files:
dcdiag /v /c /d /e /s:dcname >c:\dcdiag.log
repadmin /showrepl dc* /verbose /all /intersite >c:\repl.log  ["dc* is a place holder for the starting name of the DCs if they all begin the same (if more then one DC exists)]
dnslint /ad /s "DCipaddress" (http://support.microsoft.com/kb/321045)
ADREPLSTATUS
http://www.microsoft.com/en-us/download/details.aspx?id=30005 can also be exported to file.
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://blogs.msmvps.com/MWeber
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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