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Exchange 2010 CAS and DAG Servers to be moved to DR Site

MANGO247
MANGO247 asked
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Last Modified: 2012-06-27
Hi I have 4 Exch 2010 servers on Win 2008 R2 Enterprise. CAS and DAG are all working fine. Both of my DAG servers have MBX/HT roles. I initially planned to move 1 member of DAG and 1 member of CAS i.e total 2 out of 4 servers to my DR site. I know CAS array needs to be in same subnet so i decided to extend my vlan.

However for some reason i cant have same vlan on both sites. This leaves me to a situation to have a work around. Im now thinking to leave 2 CAS servers on main site along with 1 MBX/HT (DAG) and move 1 member of DAG in DR site. I know it will work fine if users are on main site. However if users are on DR site then they will have no CAS. For this im thinking to install CAS role on same MBX/HT server which is also a member of DAG.

My question is, would it work? i.e. will my users on DR site be able to connect to MBX/HT server in DR? Sorry if it sounds too straight forward but its a production environment and i dont want to take any chances.
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