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Number of Domain Controllers on Network

Posted on 2007-11-19
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Last Modified: 2010-04-20
We have 20 servers and have 6 domain controllers. Why would you need more then 2 domain controllers?

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Question by:mkurtzhals
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mmcodefive earned 300 total points
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Depends on your network setup. I have a domain controller in every remote office. In my main office I have two so if one goes down you have a secondary one to take over. You would not need six in one location unless you had some extremely permissions intensive application or something to that effect.
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by:mkurtzhals
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Yep we have only one location..
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by:mmcodefive
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Unless you have hundreds of users and I mean it takes a lot to slow down an well implemented AD server. Then just two is probably going to work as well or better then six. Remember the more servers you have the sysvol has to replicate amongst all the servers.
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by:mkurtzhals
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That was my reason why I wanted to demote them becuase of replication issues.  We only have 80 users.  I still am not sure on the logic of 6 domain controllers.
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by:Network_Data_Support
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is a bit much for that amount of users im all for redundany but i would use at least 3 of them for something else
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by:mkurtzhals
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I am guessing the last admin just promoted every new server to be a domain controller??
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by:Network_Data_Support
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crazy
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by:mmcodefive
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I agree demote 3, 6 is way too many. I have about the same number of users on two and its fine.
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by:tigermatt
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To be quite honest, 1 well-implemented DC with the correct hardware running 80 users is nothing, so you could quite safely demote 3 - 4 of your current DCs and provided the ones you leave behind still have the FSMO roles and there is at least one global catalog, you won't have any problems.

20 servers is quite a lot for 80 users, not that I'm straying this question off course but are you running some intensive database package or something?

-tigermatt
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by:Network_Data_Support
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yes we have 2 dc in one site that got well over 100 users and they work fine both service DNS, DHCP aswell
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by:mkurtzhals
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We have 10 servers running pretty intensive DBs/applications.  Unfortunantly I have lost the debate on vmware.  I really wish we could consolidate some of our programs but at this point it is not an option.

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by:Jay_Jay70
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hmm 2 is reccomended, anything more actually decreases performance in some circumstances.....two per site with a single GC is optimal....both DC's should be DNS boxes as well...I have 3 in my central site purely for redundancy as i have a large network....but two is ideal
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