Ramblings from another nerd on the grid
iSCSI Target Storage Provider enables applications on a server that is connected to an iSCSI target to perform volume shadow copies of data on iSCSI virtual disks. It also enables you to manage iSCSI virtual disks by using older applications that require a Virtual Disk Service (VDS) hardware provider, such as the Diskraid command.
This download package must be installed on any application server running a Windows Server release prior to Windows Server 2012 that plans to use iSCSI Target Server in Windows Server 2012. This is required in order for VDS/VSS hardware providers to communicate with iSCSI Target Server in Windows Server 2012.
System requirements - Supported operating systems: Windows Server 2008 with latest service pack, Windows Server 2008 R2 with latest service pack.
Go get it @ http://www.microsoft.com/en-us/download/details.aspx?id=34759.