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 […]


Configure DAG in Exchange 2013

In Exchange 2013, Mailbox server high availability is provided by a feature called Database Availability Group (DAG). DAG uses failover clustering feature of Windows Server. The feature, Windows Failover Cluster will be automatically installed in each nodes when you setup DAG members, so no need to install it manually early. The underlying Windows OS where […]


Configure VMware vSphere HA in vSphere 5.5

VMware vSphere High Availability (HA) feature is used to prevent unplanned downtime that could cause from hardware failure, power outage, etc. VMware vSphere HA protects against host failures, guest OS failures and application failures by restarting the virtual machine in another host within the cluster. So configuring HA is one of the important tasks in […]