Solved

Troubleshooting DAG database failover root cause

Posted on 2013-10-30
4
1,230 Views
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!
0
Comment
Question by:First Last
  • 2
4 Comments
 
LVL 42

Assisted Solution

by:Amit
Amit earned 500 total points
ID: 39611586
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.
0
 
LVL 1

Accepted Solution

by:
First Last earned 0 total points
ID: 39611595
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.
0
 
LVL 19

Expert Comment

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.
0
 
LVL 1

Author Closing Comment

by:First Last
ID: 39621067
Found half of own answer
0

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We are happy to announce a brand new addition to our line of acclaimed email signature management products – CodeTwo Email Signatures for Office 365.
This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
In this video, we discuss why the need for additional vertical screen space has become more important in recent years, namely, due to the transition in the marketplace of 4x3 computer screens to 16x9 and 16x10 screens (so-called widescreen format). …
Windows 8 came with a dramatically different user interface known as Metro. Notably missing from that interface was a Start button and Start Menu. Microsoft responded to negative user feedback of the Metro interface, bringing back the Start button a…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now