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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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12 Comments
 
LVL 6

Accepted Solution

by:
mmcodefive earned 1200 total points
ID: 20315313
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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LVL 2

Author Comment

by:mkurtzhals
ID: 20315341
Yep we have only one location..
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LVL 6

Expert Comment

by:mmcodefive
ID: 20315370
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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LVL 2

Author Comment

by:mkurtzhals
ID: 20315462
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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LVL 12

Expert Comment

by:Network_Data_Support
ID: 20315503
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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LVL 2

Author Comment

by:mkurtzhals
ID: 20315512
I am guessing the last admin just promoted every new server to be a domain controller??
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LVL 12

Expert Comment

by:Network_Data_Support
ID: 20315544
crazy
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LVL 6

Expert Comment

by:mmcodefive
ID: 20315606
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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LVL 58

Assisted Solution

by:tigermatt
tigermatt earned 400 total points
ID: 20315694
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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LVL 12

Expert Comment

by:Network_Data_Support
ID: 20315732
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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LVL 2

Author Comment

by:mkurtzhals
ID: 20315764
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.

Thanks
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LVL 48

Assisted Solution

by:Jay_Jay70
Jay_Jay70 earned 400 total points
ID: 20315817
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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