Hello guv,
You have to upgrade the schema on the schema master with an account of the
schema admins. 2008 will be schme aversion 44 and 2008 R2 needs also a schema
upgrade to version 47. You can check with "schupgr" in a command line the
version.
As long as you not raise the functional levels to Windows server 2008/Windows
server 2008 R2 you wan't have additional options for DCs, but you have additional
functionalities like group policy preferences also with having 2008 member
servers.
Fine grained password policies for example requires all DCs to be 2008 and
functional levels as Windows server 2008.
Active directory recycle bin for example requires Windows server 2008 R2.
You should install additioanl DCs instead of using in-place upgrade in my
opinion. It is always better to use a fresh install with clean OS version.
Adprep 2008:
http://technet.microsoft.com/en-us/library/cc731728(WS.10).aspx
Functional levels 2008:
http://technet.microsoft.com/en-us/library/cc771132(WS.10).aspx
See here for starting with a new installed DC:
!!!NEVER START BEFORE HAVING CREATED AND TESTED A BACKUP OF YOUR DATA/MACHINE!!!
- On the old server open DNS management console and check that you are running
Active directory integrated zone (easier for replication, if you have more
then one DNS server)
- run replmon from the run line or repadmin /showrepl(only if more then one
DC exist), dcdiag and netdiag from the command prompt on the old machine
to check for errors, if you have some post the complete output from the command
here or solve them first. For this tools you have to install the support\tools\suptools.msi
from the 2003 installation disk.
- run adprep /forestprep and adprep /domainprep and adprep /rodcprep from
the 2008 installation disk against the 2003 schema master, with an account
that is member of the Schema admins, to upgrade the schema to the new version
(44), you can check the version with "schupgr" in a command prompt.
- Install the new machine as a member server in your existing domain
- configure a fixed ip and set the preferred DNS server to the old DNS server
only
- run dcpromo and follow the wizard to add the 2008 server to an existing
domain, make it also Global catalog and DNS server.
- for DNS give the server time for replication, at least 15 minutes. Because
you use Active directory integrated zones it will automatically replicate
the zones to the new server. Open DNS management console to check that they
appear
- if the new machine is domain controller and DNS server run again replmon,
dcdiag and netdiag (copy the netdiag from the 2003 to 2008, will work) on
both domain controllers
- Transfer, NOT seize the 5 FSMO roles to the new Domain controller (
http://support.microsoft.com/kb/324801
applies also for 2008), FSMO should always be on the newest OS DC
- you can see in the event viewer (Directory service) that the roles are
transferred, also give it some time
- reconfigure the DNS configuration on your NIC of the 2008 server, preferred
DNS itself, secondary the old one
- if you use DHCP do not forget to reconfigure the scope settings to point
to the new installed DNS server
- export and import of DHCP database for 2008 choose "netshell dhcp backup"
and "netshell dhcp restore" command (
http://technet.microsoft.com/en-us/library/cc772372.aspx)
Demoting the old DC
- reconfigure your clients/servers that they not longer point to the old
DC/DNS server on the NIC
- to be sure that everything runs fine, disconnect the old DC from the network
and check with clients and servers the connectivity, logon and also with
one client a restart to see that everything is ok
- then run dcpromo to demote the old DC, if it works fine the machine will
move from the DC's OU to the computers container, where you can delete it
by hand. Can be that you got an error during demoting at the beginning, then
uncheck the Global catalog on that DC and try again
- check the DNS management console, that all entries from the machine are
disappeared or delete them by hand if the machine is off the network for ever
- also you have to start AD sites and services and delete the old servername
under the site, this will not be done during demotion
Best regards
Meinolf Weber
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