You can enable the iSCSI initiator by using Windows PowerShell to start the Microsoft iSCSI Service and change the service startup type to Automatic by running these two commands:
Set-Service msiscsi -startuptype "automatic"
The above tip was excerpted from Mitch Tulloch's book Training Guide: Installing and Configuring Windows Server 2012 from Microsoft Press.
Mitch is a nine-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows administration, deployment and virtualization. For more information see http://www.mtit.com.