Exchange server for DR

Currently we have 2 sites and all users are in Site A and Exchange servers (CAS, HUB and 2 Mailbox servers in a DAG) in Site B. Users connect to email using outlook and everything is fine.

Now as a DR solution, we wanted to install Exchange in Site A and configure users to connect  to local Exchange server.

I am planning to install One server with CAS, HUB, MBX and part of DAG. Now how do i point users to this new CAS ?  and where should i my witness server located?

any answer is greatly appreciated!
stratomanAsked:
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abdulalikhanConnect With a Mentor Commented:
You need to install CAS, HUB and MBX in Site A and point all the users to this CAS to access the local Mailbox Server.

For the Witness Server you need to put it on Site B.

But the design you want is not recommended as Site B looks as your primary site as it is containing the maximum Mailbox Servers and witness server should be placed with the maximum number of Mailboxes.
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abdulalikhanCommented:
Further, I want you to move one of the Mailbox server from Site B to Site A as all the users are in site A.

I would also clarify that for High Availibility you are only using DAG but for CAS and HUB HA is missing.

For details on DR site setup see the link below,

http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/planning-deploying-testing-exchange-2010-site-resilient-solution-sized-medium-organization-part1.html
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