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Adding a third Domain Controller to our network

We currently have two virtual Domain Controllers on our network.  We wish to add a third (physical) to give us a bit more redundancy.

Reading the various instruction guides, the process seems to be quite straight forward (run dcpromo.exe etc) but every guide I read seems to be for adding a '2nd' DC.

Is the process any different if I am adding a 3rd DC?
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fieldj
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fieldj
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4 Solutions
 
rhandelsCommented:
Hey,

No, normally the process isn't any different but what version of Windows Server are you using? Because nowadays you need to add the ADD feature to the server instead of using the dcpromo command.
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fieldjAuthor Commented:
It will be 2008 R2.
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rhandelsCommented:
If the other DC's are allready 2008R2 then just follow any link you can find in installing a new domain controller into the domain. There is no difference in adding a second or third Domain controller.
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fieldjAuthor Commented:
The existing DC's are both Server 2008 (32bit) (NON R2)
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Miguel Angel Perez MuñozCommented:
Since your DC are Win2008 without R2 and new will be windows 2008r2, you must to modify schema before adding,
from your Win2008R2 disk, must to run adprep /forestprep and then /domainprep: http://myexchangelink.wordpress.com/2012/03/23/installing-windows-server-2008-r2-as-an-adc-in-existing-domain/

Then, run dcpromo and protome as secondary dc on your domain.
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fieldjAuthor Commented:
Hi Miguel,

Thank you for your comment.

I believe that my colleague may have already done this in the past.  Is there a way I can check that the schema has already been modified?
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Miguel Angel Perez MuñozCommented:
Since the adprep is done, you can add this domain controller. If not, simply you get an error and can not do it.
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fieldjAuthor Commented:
OK, great. Thanks
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fieldjAuthor Commented:
Just one more question I think.

Is there any reason I should do this 'out of hours'?  I presume adding an additional DC will have no effect on the live environment?
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rhandelsCommented:
Nope it won't (if anyhting goes well) but i'd still always do stuff like this out of hours even though impact will not be that big. The thing that will happen is that information will be synced to this new DC and logons might be slow due to that.
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fieldjAuthor Commented:
OK, thanks everyone.
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