Exchange Server 2013 architecture

Hi
We are planning to migrate Exchange server 2010 to 2013 with DR.
Could anybody please tell me the recommended design for this..
I am planning to put two CAS Server, two mbx server in production site and one CAS server , one MBX server in DR site.
Enabling DAC in DR site.
This design is ok or else i need to put all roles in two server in production and one in dr..
Please advise...

Either option would leave you with at least one available server per role in the main site, except that with two servers, you would have two servers holding the role not affected by the failure of a given server.
For example, you have CAS1, CAS2, MBX1, MBX2.
If MBX1 fails, you still have two CAS.
If CAS1 fails you still have two MBX.
What's generally more of a problem is quorum for the DAG cluster.
If you loose the main site, the database mailboxes cannot mount in the DR because they would not "have quorum".
This is adressed at the bottom of this article:
http://technet.microsoft.com/en-us/library/dd979799(v=exchg.150).aspx
This also addresses the notion of "quorum":
http://www.msexchange.org/articles-tutorials/exchange-server-2013/high-availability-recovery/exchange-2013-dag-dynamic-quorum-part1.html
You might address this (at a greater cost) with two DAG nodes in each site and with a FSW and alternate FSW.
Just a note: if you want all-around high availability, you would want to consider the CAS role as well (perhaps you have) which usually involves use of some form of load-balancing (or DNS round robin in a worse case scenario - not optimal).
Load-balancing between distant sites can be more of a challenge. If you have more questions, ask away.
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

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