I don't think the NX300 offers an iSCSI target option. The NX3000 does though. Do you have an NX300 and were you maybe looking at the NX3000 documentation, or do you actually have an NX3000?   NX300 documentation <ADMIN NOTE: Broken link has been removed from this post by Dell>   has nothing on iSCSI target software listed. NX3000 documentation lists an iSCSI deployment guide.
I recently purchased a PowerVault NX300 with WSS2008 Standard.  I am attempting to setup an iSCSI target, but every setup article I read begins with starting Microsoft iSCSI Software Target from the Adminitstrative Tools menu.  However, iSCSI Software Target is not in my Admin menu.  I am using a domain admin account, have full rights to the server and have the file services role installed on the machine.   Could you please let me know how to gain access to iSCSI Targets?  Every article I can find states this should be installed directly from the vendor on any WSS machine.   Thank you!
iSCSI Targets & NX300