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DAG Setup Questions Exchange 2010

Posted on 2012-12-28
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Hi,

I have a DAG setup spread over two physical sites and broken up with two AD sites, connected via MPLS. The witness server is located with the DR server in the other location. Last night we did a test of the fail-over capability and it did not work.

I am just wondering if I am missing something, here is my scenario:

Primary Site

Exchange Server 1 - All Roles except Edge Transport and 4 Mounted DB's with 1 Public Folder DB

Secondary Site:

Exchange Server 2 - All Roles except Edge Transport and 4 Healthy Copies with 1 unmounted Public Folder DB

In my test I shutdown Exchange Server 1 and waited about 10 minutes and tried to open my Outlook Client but it could not find a server. I thought the fail over would be automatic but maybe it is not.
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Question by:dhitechnology
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James H earned 2000 total points
ID: 38728128
DAG has nothing to do with Client access. Are you load balancing the CAS role?
Without this, your OL client isn't looking for Server 2 and won't update itself, you would have to change the settings to point to the CAS server that is up.

You will find there are ways to get this to work without a load balanced solution, such as DNS entry, but that would only work if you set your CASArray setting to an address and not a server name (i.e. mail.domain.local). Keep in mind that this is NOT an automated solution and still requires manual intervention.
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by:dhitechnology
ID: 38728192
Thank you, I am not load balancing the CAS role. I did not setup a CASArray as I incorrectly assumed Auto-Discover ran each time my OL client started and would direct me to whatever CAS responded.

I guess in order to work as I want this to, I need to setup a CASArray between the two servers. I am ok with anything that requires manual intervention since I just have to document what needs to be done. But I certainly do not want to have to touch every client in a disaster scenario.
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