You should not install the iSCSI Target Storage Provider role service on a server that has the iSCSI Target Server role service installed. Instead, install the iSCSI Target Storage Provider on the server you use to centrally manage storage for your environment.
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.