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Global Catalog (GC) or Domain Controller (DC) In Sites and Services

Posted on 2013-06-14
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Last Modified: 2013-06-15
We just added two 2012 servers to our 2003 domain and added the DC roles.  In Sites and Services Console all servers say they are Global Catalogs "GC" and none "DC".  We did the same exact thing at another location and one of the 4 servers is listed as a DC.  The two locations are not connected BTW, I am just stating this for comparison.

We are planning to remove the 2003 DCs soon but we are not sure is this will cause a problem or why there is a difference.

Image is attached.
GCorDC.JPG
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Question by:Tonygret
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Adam Brown earned 2000 total points
ID: 39248476
Global Catalog servers are Domain Controllers. They are just set as the servers that hold a complete, searchable copy of every object in the forest. DCs that are not Global Catalog servers only have data on the domain that they are members of. If you have a single Domain Forest, it makes no difference. If you have multiple domains in the forest, you should have at least one Global Catalog in each AD site and Physical site. Most people recommend making sure that all DCs are set as GCs as well, since this makes design easier and improves performance.

You will not run into any problems removing your 2003 DCs as long as you run DCPromo to demote them before shutting them down.
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by:Tonygret
ID: 39250282
Thank you for that very clear explanation. Well stated and to the point!
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