Sunday, September 01, 2013

Dynamic Quorum with Exchange Server

Every one who is aware about the fail-over clustering will know the importance of Quorum, Windows Server products provided this functionality of fail-over clustering for a very longer period with which automatic fail-over occurs to provide continuous availability of service if one of the cluster member fails. Quorum works on voting mechanism and when the majority of votes not available the Quorum will be lost.

Microsoft planned to further enhance this feature and introduced a new mechanism called Dynamic Quorum in Windows Server 2012 which is a very excellent feature that can provide more availability than ever where it gives the flexibility of maintaining quorum till the last node available in the cluster.

I was amazed over this feature and started searching for articles to know more on this, and below is one such article which clearly explains over this new feature and its working mechanism along with the benefits we get by using this feature inbuilt in Windows Server 2012.

Read here to know more:

Windows Server 2012 Failover Clustering Dynamic Quorum 

With the new Release of Windows Server 2012 R2 many significant updates are made to the product and in terms of our topic, We can take a look at the Significant improvements and innovations made to the "Fail-Over Clustering" through the below TechNet article.

What's New in Failover Clustering in Windows Server 2012 R2

Now, Lets take a look at how this great feature is going to assist our Exchange Server High Availability.

Dynamic Quorum with Exchange Server

Dynamic Quorum helps Exchange Server to gain more High Availability by providing more resiliency to DAG to maintain Quorum during a multiple node failure.

Exchange Server MVP Paul Cunningham has written a excellent post on his Exchange Server Pro site, where he explains over this topic and also tests the functionality in real time over a Exchange Server 2013 DAG and shows us the benefits in detail.

Read here to know more :

Improving Resilience of Exchange Server 2013 Database Availability Groups with Windows Server 2012 Cluster Dynamic Quorum

Also read this Post from TechTarget

Use Dynamic Quorum to change database availability group behavior


With the New Release of  Exchange Server 2013 Sp1 many significant improvements are made to the way how Dynamic Quorum can be utilized with Exchange. Windows Server 2012 R2 added more great features within the Dynamic Quorum capabilities to the product and now with this new Exchange Server 2013 SP1 release it added the support for installing Exchange Server 2013 on Windows Server 2012 R2 and this makes us to gain the complete benefits of  the new Quorum model and Increase the High availability in the Environment.

Read these blogs below to know more...

Windows Server 2012 R2 and Database Availability Groups

Exchange 2013 SP1 introduces simplified DAGs

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