Global catalog, sites, demoting server

Posted on 2011-09-20
Last Modified: 2012-05-12
I have two sites, and three servers.  Site 1 has Server A and Server B.  Site 2 has Server C.

All three of these servers are ADs.

I am in the process of removing Server A from the network.  I have transferred all the FSMO roles to Server B.  Just after doing that, I made B a Global Catalog Server (A was one already, and C is one as well).

Enough time has passed, so I want to remove the GBC setting from Server A.  Just before I did that, though, something made me pause.

When in Active Directory Sites and Services:

Site 1 has Servers A and B.  When looking at the NTDS settings for A, it has two objects, <automatically generated> B and C.
However, Server B only shows <automatically generated> A.

Site 2 has C.  Its NTDS settings only shows <automatically generated> A as well.

It has been a few days since I checked off B as a GBS.  I am not even sure if this is a problem.  I guess I would feel more comfortable if the NTDS setting for B showed C, and the setting for C showed B.  

I hope that makes sense.  Let me know if I need to clarify, or if I even have an issue.


Question by:tnorman
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LVL 57

Expert Comment

by:Mike Kline
ID: 36568063
Verify that replication is working using repadmin, the KCC usually does a good job and it is not a good idea to turn that off (especially in smaller environments)

You don't need automatically generated connections for from/to every server.



Author Comment

ID: 36568107
MKLine...thanks for that.

I am not worried about the auto-generated part, I was just including that to make it more clear as to what I was talking about/describing.

I am worried that the server I am transferring to (B), doesn't have a connection to (C).  Since (A) is going to be removed, that is my concern.

I will investigate that repadmin as you suggested.  I am going to keep this question open though for further input.
LVL 57

Expert Comment

by:Mike Kline
ID: 36568150
When you remove A the KCC will see that and new connection objects will be created.
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Author Comment

ID: 36568184
Here's a terrible question: are you 100% on that?  Sorry to ask, but to say this is a 'high-maintenance' client would be an understatement.
LVL 37

Assisted Solution

by:Neil Russell
Neil Russell earned 50 total points
ID: 36568233
yes that is correct.

The real question should be... Why only one DC per site? And why was B never a GCS?

Author Comment

ID: 36568286
Good questions.

1) Site 2 is very small.  Site 1 will have two DCs again.  I am removing one, and putting in a brand new 2008 box.

2) Site 1 isn't that overly large, and didn't think I needed two GCSs.  A lot of the reference material, etc. says to not have 'unnecessary' GCSs, to limit traffic, etc.

I am going to 'check off the box' now.  Let's see what happens!


Assisted Solution

by:Amitabh Singh
Amitabh Singh earned 150 total points
ID: 36568292
the main purpose of GCS (Global Catalog Server) is creating Index for all AD objects , its making this to boost performance of admin search (when admin search any object in AD ) and when system need information about any AD object its provided by this Index !

so GCS (Index file ) is the main server which replicate between the Sites and its make all DC to get all information in fast ,

so its not a problem if you don't have any server with GCS option sign , it will just slow down your replication and user search for non Indexing site , but it will still work .

Now Sites : main purpose of configuring or other word creating multiple sites is to schedule replication time , replication topology .

but you have just 2 DC remaining so their is no need to  configure Sites because their is vary less replication traffic !
LVL 57

Accepted Solution

Mike Kline earned 300 total points
ID: 36568302
One DC per site is fine, just never run a domain with one DC.

Always try and make every DC a GC, see bullet one

in  single domain like yours a GC doesn't play much of a role anyway so just make them all GCs.


LVL 37

Expert Comment

by:Neil Russell
ID: 36568403
"Now Sites : main purpose of configuring or other word creating multiple sites is to schedule replication time , replication topology .

but you have just 2 DC remaining so their is no need to  configure Sites because their is vary less replication traffic ! "

What twaddle!!!!

Please understanf a subject BEFORE you post misinformation and misguide people.

Please read

As you can see the MAIN use of sites a hell of a lot more than replication.

Author Comment

ID: 36568404
Thanks everyone.

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