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réplication between 2 differents DAG in Exchange 2013

Posted on 2014-07-21
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Last Modified: 2014-08-27
hello,

i have an exchange 2013 with 1 dag named dag 1 with 6 servers 3 active and 3 passive and 6 database in the same datacenter.

i need to now if its possible to create a dag 2 in a second datacenter, with 3 servers and réplicate all database from dag1 to dag 2. When i have a problem in datacenter 1 i can bring on the dag 2 database online and all user make Outlook access on.

i need this because at this time i have 9 servers on the same dag with 6 server in datacenter 1 and 3 in datacenter 2. if datacenter1 is off, the move to datacenter 2 will not work because the majority of server is in datacenter 1==> are this right?

thank you for help
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Question by:cawasaki
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by:irweazelwallis
ID: 40208452
fairly certain you can't be a member of 2 DAG's but there is an easier solution to your question.
you can just change the weighting on the servers in the 2nd datacentre so that 3 three servers will be able to take control.
i think if you use dynamic quorum control then it might sort it out for you

http://www.msexchange.org/articles-tutorials/exchange-server-2013/high-availability-recovery/exchange-2013-dag-dynamic-quorum-part1.html

if you come up with a few test plans then schedule a DR test to move them around so that you have something that works and a time scale for how long to have it up and running
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Author Comment

by:cawasaki
ID: 40208540
hello,

thank you for this, so if i understand, i need to create a dynamic quorum from windows 2012 cluster?
are the weight is configured automaticly?  so if i understand when i shut down my 6 server in datacenter 1,  my 3 servers in datacenter 2 will continue to work with database online?

thank you
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Author Comment

by:cawasaki
ID: 40208550
i have read the part 2 here:  http://www.msexchange.org/articles-tutorials/exchange-server-2013/high-availability-recovery/exchange-2013-dag-dynamic-quorum-part2.html

and i see this:

Remember that dynamic quorum only works if the following two conditions are met:

    The cluster has a failure of a node or several nodes in a sequential order;
    The cluster has already achieved quorum.

If multiple servers fail at the same time (for example, in a disaster recovery scenario where an entire datacenter with more than one cluster member becomes unavailable), the cluster will not be able to dynamically adjust the quorum majority requirement.

Open in new window


in my case i will test a disaster recovery scenario and shut down all datacenter 1, so it will not work?
Remember that dynamic quorum only works if the following two conditions are met:

    The cluster has a failure of a node or several nodes in a sequential order;
    The cluster has already achieved quorum.

If multiple servers fail at the same time (for example, in a disaster recovery scenario where an entire datacenter with more than one cluster member becomes unavailable), the cluster will not be able to dynamically adjust the quorum majority requirement.

Open in new window

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Accepted Solution

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irweazelwallis earned 500 total points
ID: 40208670
It depends on how it fails but its possible that it might get in a muddle.
 The other two options would be -:
 to adjust the weight of nodes in the second datacentre so that they equal the combined weight of the other 6
placement of the file share witness as the other site to help the move.


i think with an uneven cluster spread you need to test out the options in the safest way possible to see what happens.

If that infrastructure is live then build some small VM's with exchange and setup in a DAG to replicate your live environment
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Author Comment

by:cawasaki
ID: 40208709
i think the easyest way is to remove 3 servers from the dag momentaly ( Stop-DatabaseAvailabilityGroup DAG -MailboxServer SERVERNAME)so i will have 3 servers in datacenter1 and 3 in datacenter 2, and i move the fileshare witness in a server on datacenter 2.  after i finalise my disaster recovery scenario, datacenter 1 is up, i move the file share witness back to datacenter 1 and i start the 3 other server (Start-DatabaseAvailabilityGroup DAG -MailboxServer SERVERNAME).

does this can work?

thanks
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Expert Comment

by:irweazelwallis
ID: 40208929
that sounds like a good plan. The file share witness should provide the majority for the cluster and help the failover.
Make sure you have a backup of the data before you start in case it goes screwy and you get a split cluster
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