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How many DNS, AD servers

We have a corporate office and 25 locations.  We have three DNS, AD servers; 2000, 2003, and a 2008.  At the remote sites we have about 50 devices.  We have computers, network printers, wall mounted computers, wireless devices, laptops, time clocks, copiers, and scanners.  We have been starting to get computers to drop off the domain.  Do I need to place a DNS, AD server at each location, since we are getting so many devices, or do I need to get rid of my windows 2000 DNS, AD server.  Does computers dropping of the domain have anything to do with too many devices at the remote facility or maybe the old DNS, AD server.?
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kevingattis
Asked:
kevingattis
2 Solutions
 
Nagendra Pratap SinghCommented:
There would be say 4 large locations in this environment. All these places need 2 DCs or more.

Rest I can say only after seeing the real numbers like Location1 device numbers etc.
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Matt_D_GreenCommented:
2 Domain Controllers/Global Catalogs at every location with a significant number of users (i.e. login requests).  DC replication issues could definitely lead to computers dropping from the domain, and age obviously impacts performance.  Upgrading to 64-bit OS (e.g. Server 2008 R2 or 2012) would allow for a larger number of requests against a smaller number of (properly sized) servers.
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Wilder_AdminCommented:
All is depending on your network connection and bandwidth. If its good enough then only at the main location you need two dcs and in every other you need 1. I would upgrade the domain to 2008 then you have so many objects what can be stored that you will never ever reach this number. all dc should be global catalog dc. so if the remote dc is not reachable the clients can get the gc from others dc in network. For that we use router for two providers one cable on mobil like umts. So the network can not get broken in any time.
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kevingattisAuthor Commented:
We have about 50 devices with 1.5 mb to 3.0 mb of bandwidth at each facility.  It looks like you are saying to have two DC at the corporate site and one DC at each facility.  Would this be a good plan?
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kevingattisAuthor Commented:
At the remote sites should I install RODC or DC?  We have a 1.5mb MPLS line at each location.  Would having a RODC or DC at the remote speed up logins.
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Nagendra Pratap SinghCommented:
RODC will cache logins. DC will have full set of user table.

Yes, they can speed up logins though 1.5 mb MPLS sould be OK for a small site.
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kevingattisAuthor Commented:
Is 50 devices a small site?  We also have a site with 75 devices.

I guess a wanted to know, is it justifiable cost to buy a server at the remote location to benefit the speed and stability of the network?
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Nagendra Pratap SinghCommented:
I would call this a medium site.
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kevingattisAuthor Commented:
Is their a number of devices recommended for adding a DC or RODC.  Is it 50, 75 or 175?  We basically have two DC at corporate.  Our facilities keep growing larger and I don't know if adding a DC at the remote site is necessary.  All the servers are at coporate, and the users use RDP TS to access the corporate programs.
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