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Is the GC server supposed to be enabled by default in child doamin?

Posted on 2008-06-10
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I created a child domain. But when I looked into the site and service, the GC server is not enabled by default for the DC in child domain... is this normal?
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Question by:wuitsung
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Its not the default - but its a good idea to make it one. Go to Administrative Tools, Active Directory Sites and Services, Expand, Sites, Default first site and Servers. Right click on the new server and select properties and tick the Global Catalog checkbox. (Global catalog is essential for logon as it needs to be queried to establish Universal Group Membership)
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by:Jay_Jay70
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yes this is normal, there is already a GC in your forest, so it doesnt create a new one - you can add the role, but it wont be there by default, the only time a GC is created by default, is in the first DC in a forest

Remember, if you are running child domains now, make sure your GC role doesnt sit on the infrastructure master
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by:wuitsung
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Thanx! What do you mean " make sure your GC role doesnt sit on the infrastructure master? "
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by:Jay_Jay70
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you cannot have the infrastructure master role on the same server as a Global Catalog server - a GC holds a partial replica of every object in the domain, if you place the GC role on the inf master, nothing will get updated :)
http://support.microsoft.com/kb/223346
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by:wuitsung
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But this sounds weired... When you install the first DC in the forest, it has the GC enabled by default and it also has the 5 single master roles by default. So if I only have 1 DC, what can I do?
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by:Jay_Jay70
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the rule only comes into play when you introduce a child domain - in a single domain environment it doesnt matter

you should have two DC's my friend, if you are going to use child domains, then in particular your root domain should have redundancy
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by:KCTS
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Let me clarify. In a single domain it does not matter which machines are Infrastructure Masters and which are Global Catalog servers, neither does it matter in a multi-domain environment where ALL Domain controllers are also Global Catalogs.

The advice about not having Global Catalog and the Infrastructre master on the same machine ONLY applies in a multiple domain where only some of the DCs are global catalogs. In such a situaltion false "phantoms" can occur.
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by:Jay_Jay70
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much better way of putting it
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by:wuitsung
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Thank you for the explanation. So if I have a single doamin,  with 2 DCs. It doesn't matter if the GC also have the 5 single master roles.

If I have a child domain and it only has 1 DC, it also doesn't matter.
But if I have 2 DCs in child domain, I should only enable GC on second DC.

Is my above statement correct? Thank you.
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by:Jay_Jay70
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if you have a child domain with 2DC's and a root domain with only 1 DC then your priorities are a little bit out of line - it should be the reverse

but yes, you are getting the right idea
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by:wuitsung
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Thanx Jay_Jay70!! But I don't understand what you mean "priorities are a little bit out of line - it should be the reverse" ?? what properties?? and which one should be reverse?
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by:Jay_Jay70
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you have a root domain - that should have 2DC's not the child...You should ideally of course have two DC's per Domain, but when dealing with child domains, you should ALWAYS have 2 DC's in the root
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by:wuitsung
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you mean I must have 2 DCs in root domain if I want to create a child domain? why? I have only 1 DC in root domain and 1 DC in child domain, but I didn't see any problem.....
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by:Jay_Jay70
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its not a "must" it wont give you any problems functionality wise, but you have no redundancy, and if you lose your root domain, you are screwed big time...you have to rebuild both domains..
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by:wuitsung
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Ok. Thank you! Because you said "you should ALWAYS ...." So I thought you mean must...
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by:Jay_Jay70
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lol, pleasure - but keep in mind you run a big risk if you run just a single DC in the root :)
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by:wuitsung
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Sorry.. just a last question... if you say redundancy is important for root domain, so how about child domain? redundancy is not that important in child domain?
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by:Jay_Jay70
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nowhere near as important - i mean, sure, you should still have multiple DC's or you will lose the child, but at worst, you lose the child, not the entire structure
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by:wuitsung
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Thank you so much!
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by:Jay_Jay70
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pleasure
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by:wuitsung
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Hi Jay_Jay70, May I ask you another question on the GC again here?  http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_23477107.html
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