In Hyper-V Server 2008 (download) and Server Core Installations of Windows Server 2008 (download) to connect to SAN storage you would use the iscsicli.exe tool. This is the command line equivalent of the iSCSI client configuration tool. This command line tool requires you to utilize your asterisk button a lot. (to accept default values)
Typical commands to connect to your SAN storage look like these:
iscsicli qaddtargetportal iscsihost.domainname.tld UserName Password
iscsicli persistentlogintarget quorum T * * * * * * * * * * * UserName Password 1 * 0
iscsicli persistentlogintarget vms T * * * * * * * * * * * UserName Password 1 * 0
iscsicli qlogintarget quorum UserName Password
iscsicli qlogintarget vms UserName Password
Not really intuitive, but when you’ve read the Microsoft iSCSI Software Initiator User's Guide and have memorized Appendix C of the document you’re basically ready to go.