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Global Catalog and Infrastructure Master placement clarification

Posted on 2003-10-22
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Last Modified: 2010-04-13
Hi all,

Long time listener, first time caller....

I'm trying to clarify the placement of the Infrastructure Master roll on a GC (Win2k domain).

I will have 2 Domain Controllers in my child domain, and as E2k will be implemented in the not too distant future, I would like some Global Catalog redundancy, hence making both DC's GC's.

The following article states "If every domain controller in the domain also hosts the global catalog, then there are no phantoms or work for the infrastructure master to do. The infrastructure master may be placed on any domain controller in the domain."

http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q223/3/46.ASP&NoWebContent=1

So if I have a child domain, can I safely make all (well both in my case) GC's (so includes Infrastructure Master). DC's in other domains in the forest are not necessarily all GC's.

Appreciate any advice on this.

Thanks,

Andrew


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Question by:aread-NZ
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by:vivekpara
ID: 9600313
Its a no brainer.  Having the other server will incur some extra overhead by being a global catalog...but its probably worth the redundancy.  As long as you have the bandwith and the memory (on a small network it is not noticeable at all), you will have no problems.
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Author Comment

by:aread-NZ
ID: 9600858
So aslong as all DC's are GC's in my domain, the infrastrucure master being on a GC is ok, regardless of how the FSMO rolls are setup in other domains in the forest?
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vivekpara earned 150 total points
ID: 9601330
Correct.  The role is really just a way of saying that a computer is a PDC for the infrastructure.  In a sense, the PDC hasn't really disappeared...its just been divided.  The role of infrastructure master is really only useful if many changes are occurring on the network structure frequently.  You can actually have the infrastructure master down and have no one be the wiser.  It is the grand high pooba of members of groups that are moved.  The infrastructure master keeps track and alerts the Global Catalog servers when a change has been made so that a user will be properly authenticated in their new domain immediately.

If you ain't moving people around (or objects), this will pose little to no impact on your network.

As an aside, I actually brought my infrastructure master down for what (I had thought) would only be a day.  Turned out to be two weeks.  I don't recommend it, but the domain worked fine as long as I didn't try to modify any groups.

The fact that it is a GC has no effect.  Otherwise, in a single domain/single domain controller mode, you wouldn't be able to run it.  It adds an insignificant amount of overhead comparatively to have an Infrastructure Master and GC on the same computer.

Don't worry.  Go ahead and do it, is my opinion.  Unless that computer is running SQL AND Exchange (or equivalently high processor/thread intensive applications) on it as well, you should have no problems.
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Author Comment

by:aread-NZ
ID: 9604938
Thanks for the explaination, imuch clearer now.

Regards Andrew
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