Move File Share Witness to another server

DAG is configured in my client’s Exchange environment and the file share witness is configured as a hub transport server. Due to the O365 migrations, the management has decided to cut short the number of on-premise servers. Hence, the current FSW server which also happen to be a CAS/HUB server was planned for decommission. So we had to move the FSW role to a different CAS/HUB server.

This can be achieved either using GUI or shell.

In GUI, select the DAG properties and modify the existing values with the new directory and server details. Once done, click OK and confirm whether the changes have been reflected or not.

In order to make this exact change through Exchange shell, execute the below command:

Set-databaseavailabilitygroup -witnessdirectory “Directory” -witnessserver “ServerName” -identity “DAGName”

To confirm, execute the command:

Get-DatabaseAvailabilityGroup -Identity “DAGName” | Select Wi*