Ran into an error this morning trying to add members to a DAG running on Server 2012
When I try to add the nodes to the DAG I got the error
“You must provide an value for this property”
Decided I better do some reading on TechNet regarding 2010 DAGs and Server 2012 and it turns out that you must pre-stage the CNO (Cluster Named Object)
The documentation states
Pre-staging the CNO is required for Windows Server 2012 DAG members due to permissions changes in Windows Server 2012 for computer objects.
There are 2 methods to achieve the pre-staging.
- Add the “Exchange Trusted Subsystem” group with Full Control to the CNO
- Add the first DAG member with Full Control to the CNO
For me I choose to add the “Exchange Trusted Subsystem”
Adding the Nodes to the DAG after making the necessary changes worked without issue