Global catalog server benefits

Posted on 2013-05-13
Last Modified: 2013-05-24
If I understand, Theoretically,  when we have one domain with multiple sites or multiple domain in the same forest with multiple sites, we need to enable global catalog on the domain controller of each site, otherwise the login process of the users at each site will be slower than it is supposed to be.
if that s true, Can someone explain why this would slow the login process ?
Thank you
Question by:jskfan
LVL 10

Assisted Solution

ienaxxx earned 83 total points
ID: 39161704
because GC is a catalog of the objects of the entire domain/forest and it's needed by the login process, so your logins will not only be slower if you don't have a GC in a site, cause the logins require WAN traffic, but also will become impossible for you to login in a iste if you loose the WAN link.

LVL 13

Assisted Solution

Jaihunt earned 333 total points
ID: 39161784

Check the below link it will help you to understand.


Author Comment

ID: 39161852
does that mean the domain controller on each site without GC would not have enough information to authenticate the user login ?
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.


Author Comment

ID: 39161956
it makes sense when there are multiple domains in multiple Universal groups are involved.
I am not sure when there is one domain and multiple sites, where Universal groups are not needed.

Author Comment

ID: 39162564
Any follow up on this ?
when there is one domain and multiple sites, where Universal groups are not needed. how would the non presence of GC on a domain controller at a certain site slow down the login process.

Assisted Solution

VirastaR earned 84 total points
ID: 39164083

Global Catalog Server Requirement for User and Computer Logon

Hope this helps :)
LVL 13

Accepted Solution

Jaihunt earned 333 total points
ID: 39164107
For a Single domain environment GC is not Important for Login process. But you will require GC when you search the domain it will help to give the query results fast.

Please check the below links for more info.

Author Closing Comment

ID: 39195742
Thank you

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