Pre Stage DAG Cluster Name Object (CNO) in Exchange 2013

If you are configuring Exchange 2013 Mailbox DAG, you must pre stage DAG Cluster Name Object (CNO) in Active Directory. CNO is an active directory computer object that simply provides an identity to DAG and cluster. In this post, I will show steps to create CNO in Active Directory. Pre Stage DAG Cluster Name Object […]


Configure DAG Witness Server in Exchange 2013

Database Availability Group (DAG), a high availability feature for Mailbox servers in Exchange 2013 requires a witness server to maintain a Quorum. Quorum is used by Windows Failover Clustering feature which uses voter count to sustain/function the cluster. In Exchange 2013, DAG can use two different modes of Quorum, Node and File Share Majority (used when DAG is […]


Understanding the Role of Active Manager in Exchange 2010

After understanding DAG in Exchange 2010, it is also important to understand the role of Active Manager in Exchange 2010. Active Manager is a new component in in Exchange Server 2010. It replaces the failover management and resource model features in cluster service used in Exchange 2007. Windows failover cluster is still used by Exchange […]


Configure Database Replication in Exchange 2010

In the previous article we saw how to configure Database Availability Groups in Exchange 2010. We will now configure database replication in Exchange 2010. Database replication is basically replicating the Mailbox Database from one member in the DAG to another member. You can also call Database replication as adding database copies. In this post we will […]


Configure DAG in Exchange 2010

Database Availability Groups(DAGs) in Exchange 2010 is a Data Redundant, High Availability, site resilience and disaster recovery feature. Adding multiple mailbox servers to the DAG and replicating all mailbox databases with other member servers will provide high availability at the database level. You will need at least two Mailbox Servers to configure DAG in Exchange […]


Failed to Add or Remove the Failover-Clustering Feature

I was installing Exchange 2010 with a standard configuration supporting two DAG members. DAG configuration was successful, but got this error when I tried to add the member server to the DAG, the error was “Failed to add or remove the Failover-Clustering feature”. This article shows how you can get around this error. Failed to Add or […]