For maintenance reason you want to disable DFS target(s) or DFS namespace, to do that you can:
To enable or disable referrals by using Windows PowerShell, use the Set-DfsnRootTarget –State or Set-DfsnServerConfiguration cmdlets, which were introduced in Windows Server 2012
Web resources:
https://msdn.microsoft.com/en-us/library/cc771266.aspx
https://technet.microsoft.com/en-us/library/cc771266%28v=ws.10%29.aspx
