Re: Migrate 2003 domain to 2008 domain
- From: "Isaac Oben [MCITP,MCSE]" <isaac.oben@xxxxxxxxxxxxxxxx>
- Date: Fri, 13 Mar 2009 08:50:15 -0500
Hello KC,
You can use a simple script in powershell or vbscript to accomplished this.
--
Isaac Oben [MCTIP:EA, MCSE]
"KC" <KC@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:05D5D1CE-17B4-4B16-B69C-678AC31C7785@xxxxxxxxxxxxxxxx
Hi Meinolf, thank you for the response. If the environment has over thousand
of clients, changing the DNS settings per client might not be very practical
if you have limited staff. Is there a way where you still do the replacement
with new server hardware and with new server name but you reuse the old IP
address for DNS sake? Thanks again.
"Meinolf Weber [MVP-DS]" wrote:
Hello KC,
See inline
Best regards
Meinolf Weber
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> Thank you Isaac for the quick response. If I understood you correctly,
> the migration procedures/steps should be as follows:
>
> 1) Install Win2003 SP1 or SP2 on all three Win2003 DCs.
SP2 and all latest patches to make sure the OS is complete for the upgrade
to 2008.
> 2) Run repadmin /showrepl, dcdiag and netdiag on the DC then check for
> any
> error.
Check any DC for errors.
> 3) Run adprep.exe /domainprep /gpprep then run adprep.exe /rodcprep on
> the
> infrastructure master role holder DC.
You have to start with adprep /forestprep and then /domainprep, /gpprep is
not needed when upgrading from 2003 (you can run it if you like). Also run
adprep /rodcprep to prepare for Read-only domain controllers, maybe you like
to have them in the future and so this is done. If you have split the FSMO
roles you have to choose the correct FSMO DC, thats fine.
> 4) Run adprep.exe /forestprep on the schema master role holder DC.
See above.
> 5) Join the two new Win2008 servers on the domain as member server.
Ok, make sure to point the preferred DNS only to one acting DC/DNS server
until replication after promoting later is done.
> 6) Add the AD DS role without DNS server and GC on to the two Win2008
> servers.
Why? Do it direct during promotion, no problem and all is replicated complete
AD, DNS and GC.
> 7) Verify all DC replications are fully functional and check for any
> error.
To use netdiag on 2008 you have to copy the netdiag.exe from 2003 to the
2008 windows\system32 folder, not included as the others. Works also without
any problem on 2008.
> 8) Add DNS server and GC to the newly Win2008 servers.
See above.
> 9) Move AD-integrated DNS zones to the newly created partitions on the
> new
> Win2008 servers.
See above.
> 10) Change the client's DNS entry on LAN settings to point to the new
> Win2008 DCs one client at a time and make sure the name resolution is
> working. Check the DNS event log.
Ok.
> 11) Use the NTDSUTIL to move the forestwide OM roles to one of the
> Win2008 DC.
You can also use the AD management consoles. http://support.microsoft.com/kb/324801
> 12) Use the NTDSUTIL to move the domainwide OM roles to the Win2008 DC
> chosen on step (11).
You can also use the AD management consoles. http://support.microsoft.com/kb/324801
> 13) Run dcpromo to demote the two old Win2003 DCs.
WAIT until you have really tested all functionality for some days. For the
test just remove the network cable form the old DC's so that all must run
with the new ones. If every service/application/role is working as expected,
reconnect, let them replicate again, check replication and then start with
demotion.
> 14) Use ADSIEdit from Win2008 DC to retire "phantom" domain
> controller.
If demotion is succesful, you have only to remove the old DC names from AD
sites and services. Also DNS has to be cleaned up from the old servers and
record's.
> 15) Turn off the two Win2003 servers.
After demotion the servers will move in AD UC to the computers container,
so you have to delete them there if you will not longer use the servers as
member servers in the domain.
> Thanks again.
> KC
.
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