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Troubleshooting DAG database failover root cause

Posted on 2013-10-30
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Last Modified: 2013-11-04
Hi Experts - I recently added a second exchange server at an offsite datacenter.  This server has the client access, hub transport, and mailbox server roles installed.  The two Exchange servers are in a 2 member DAG with the witness server setup back at my office with the primary exchange server.  Most of my Outlook clients are here in the main office with me so I have the active databases here set with the highest priority.

I've had several database failovers take place at night and have had to fail them back to our main office in the morning.  I'd like to try and determine why they are failing over and why they don't fail back since this side has lower value activation preference.  Many thanks in advance for any tips!
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by:Amit
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There is not automatic fail back. So it need to be done manually. For root cause why it happened, you need to check application, system and failover cluster logs.
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I found it, wound up being Veeam backups taking up resources on the primary server causing it to fail over.  I increased the values for failover per this article:

http://internationalmanofawesome.wordpress.com/2011/08/05/decreasing-exchange-2010-dag-failover-sensitivity-by-increasing-cluster-timeout-values/

Interesting that MS does not support virtualized Exchange 2010 snapshot backups since that is probably what a large portion of the install base is doing.
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by:Miguel Angel Perez Muñoz
ID: 39611597
There is no auto fail back on Exchange´s DAG: http://social.technet.microsoft.com/Forums/exchange/en-US/5b7f4057-5fc9-4855-bce7-aa130c302001/exchange-2010-dag-fail-back-to-primary-site

Check your lines between sites, may you have one faulty and causes intermittent failures.
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by:First Last
ID: 39621067
Found half of own answer
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