Need help with sites configuration

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Need help with disaster situation:

I have an active directory with a single domain and 4 domain
controllers.
I have 2 sites (A and B) configured with 2 domain controllers in each
site.
All domain controllers have a copy of my DNS zone.

All my clients have statically configured DNS servers 1 and 2 both on
site A.
Production computers have a GPO, setting their DNS servers to 3 and 4
both on site B.

Last week I had a problem and the connection from production computers
to site A was
really slow. I had tested total lost of connection to site A, and
clients correctly
logon and work with site B, but with the lost of bandwith, clients
were still
trying to reach site A, and lots of them were not being able to work:

Their computers were stuck at "Aplying computer settings..."

I am going now to statically configure all 4 DNS servers in all
computers. But I am
Still worried.

I need total indepency so if there is any problem with one site, the
other one will
make the production computers work.

The first two Domain controllers I installed are the ones at site A..

Is there any role or service I have to replicate to site B so I can
have total independency ???

All of the DC are Global Catalog Servers.

PLEASE HELP ??

.



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