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Active directory replication on windows 2003 OS

Site A has got 3 Domain controllers with Single domain, Planning to Merge to one domain controller. how to merge into one domain controller for Site A ?

and Build another Domain controller Active directory  Site B.

How does the replication process between both sites need to be done ?

OS is windows 2003 Server active directory  number of users 350.

Suggest ?
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dharnet
Asked:
dharnet
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4 Solutions
 
akhalighiCommented:
well ... shouldn't be any problem .

First of all , figure out which domain controller has FISMO role in site A . you need to keep that one and demote DC on other 2 domain controllers. If you wanted
to keep another domain controller for any reason  (e.g. better hardware , etc) , first you need to transfer all FISMO roles to that one , then run DCPromo on all other domain controllers and remove them from the environment.

Then in Site B , you need a server ... join it to the domain , make it an additional DC ( and global catalog) , join it to a separate site if it's in a different subnet . ( not a must but it's a better practice)

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akhalighiCommented:
Also make sure that you have proper network connectivity between site A and Site B. usually a VPN connection with good quality is required.
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akhalighiCommented:
Here is an article about FISMO roles.

http://support.microsoft.com/kb/324801


Here is an article about adding/removing DCs :
 http://technet.microsoft.com/en-us/library/cc758540(WS.10).aspx
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dharnetAuthor Commented:
for doing this how many hours it require to do ?
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akhalighiCommented:
It depends but it shouldn't take a long time. If DNS settings and all network connectivity are fine and you have 350 users .. I think demoting should take about 30 minutes for each server .. promoting probably the same. Please note that in some environments it may take longer specially if you are doing this over a VPN link. I'd give 2 days to this project to be done and fully tested  .
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dharnetAuthor Commented:
yes
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