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What is the optimal domain controller to users ratio for a site using Windows Server 2008 R2?

Posted on 2010-11-18
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Last Modified: 2013-11-25
We currently have around 160 users with 2 domain controllers at a site. We have some monitoring software running and it is showing over 60 LDAP connections to the each server. I am going to add another domain controller to the site but I was wondering what the correct ratio of domain controllers to users is. We are going to implement some network intensive applications so I'm assuming the LDAP connections will only get higher after that.
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Question by:pphm
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thiagotietze earned 125 total points
ID: 34170326
Hi,

Here is some documentation about this:
http://technet.microsoft.com/en-us/library/cc728303%28WS.10%29.aspx

As a quick answer I would tell you that, you don't need to care much about the number of Domain Controllers, with Windows Server 2008 R2 this is more realistic then ever was...
I said that because the number of "connections" and requests have increased a lot, with the usage of 64 bit Operating system.

If I were you, I would re-think the possibility of placing a new Domain controller.
I think it is just a waste of hardware :-)

As you can see in the document, things start to go "critical" wjen you reach 3000 users... based on ONE domain controller.


And yes, you NEED to have 2 Domain controllers, in any number of users you have in a site. It is secure, and it wort the cost.
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by:Mike Kline
ID: 34170597
You can also enable field engineering logging http://support.microsoft.com/kb/314980  to log expensive and inefficient searches

I'm with thia, you probably don't need another.  The main reason for two DCs in any size domain (even 10 users).  Is for fault tolerance/uptime.

You only have one DC and that goes down hard and you have downtime/problems for users.  You have at least two and one goes down and the users shouldn't even notice.

Thanks

Mike
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