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Exchange 2010 AD Forest Tree's

Hello All

Looking to solve a global catalog server issue i am having.
This is what the environment looks like.  We have one forest with three tree domains.  They are not child domain.  We have to locations an office and a datacenter.  In the office we have 6 domain controllers two for each domain a primary and a secondary.  In the data center we only have two server an exchange 2010 server serving up all three domain emails and one domain controller of the DC of the forest domain.
I was under the impression that the root forest domain controller held the global catalog contained all of the trees domain information i am not sure this is the case.
During some planed down time i took down one of the tree domain controllers both primary and secondary.  Users from that domain started to complain that they could not get to their email.
Due to budget and space in the datacenter I cannot just add two more DC’s for the other two domains unless it is my only option.  So the question is can I make my root domain DC in my datacenter hold all the information for all three domain.  Incase our connection to our datacenter goes down and our exchange server cannot talk to the other two domains DC’s in the office those users can still login to their email boxes.
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msellai
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msellai
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1 Solution
 
MegaNuk3Commented:
Users logon via DCs in their own domain, not in other ones. So a DC in their own domain has to be up for them to log on.

GCs will hold some forest wide details like Universal group membership

So in short if you want a better DR situation then either add 2 more GCs from the other domains to the datacenter or move 1 from each domain to the datacenter
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Vinchenzo-the-SecondCommented:
Your DC in the root will be a GC, as you only have one DC.  Do remember the root DC will be holding the Schema and Domain Naming Master which are forest FSMO roles along with the domain ones.  Really you should add another DC in the root for resilience
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msellaiAuthor Commented:
So in short i need to add DC's for each domain to my datacenter.
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Vinchenzo-the-SecondCommented:
You should have a GC on the same subnet where Exchange is sitting.  As your exchange is hosting all 3 domains it would make sense to put a DC for each domain in the data centre.  This will leave one DC for each office.  Also make all DCs GC.  You can enable this by ADSS.  Also how is your DNS configured?  
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msellaiAuthor Commented:
They pointed me in the right direction to find out what i was trying to do would not work.
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