In this post I’m going to show you the process of creating an Exchange 2016 DAG. The DAG will consist of 2 member servers and one file share witness. And as with previous Exchange versions, there are a few requirements to follow to successfully create a DAG.
To start, the .edb file and log locations will need to be consistent across all the servers that will be a member of the DAG. It’s good practice to separate out the logs and the databases to their own drives. In my case, I have placed the database files on the E: drive and the log files on the L: drive. To verify the location of these files we can run a quick PowerShell command from the EMS.
[PS] C:\Windows\system32>Get-MailboxDatabase |FL Name,EdbFilePath,LogFolderPath
Once the DAG has been successfully created, we need to add our servers to the DAG. Choose the Manage DAG Membership icon and add the desired servers to the DAG. The process will install Windows Failover Clustering on the selected servers.
Now that the DAG has been created, the only thing that is left is to create database copies across the member servers. This process can be done through the EAC. Navigate to servers, select databases, and choose the database you want to replicate. Select the more option, and then Add database copy.
[PS] Get-MailboxDatabaseCopyStatus -Identity MDB16-2