Welcome to Dave's Tech

Just so I have a quick reference:

1. Create Physical volume on a single disk
2. Create RAID volumes on multiple disks and create array
3. Add volumes from #1 into a Volume Group
4. Create an iSCSI volume in the VG from #2
5. Start the "iSCSI target server" service
6. Add a network entry for the client machine (or local subnet if private) at the bottom of "System > Network Setup"

7. Enable Services - iSCSI Target Server
8. Click "iSCSI Targets" on the Volumes page
9. Click "Add" to create a new target.
10. Click "Lun Mapping"
11. Click "Map"
12. Click "Network ACL"
13. Change the combo box for your network to "Allow".

These steps were adapted from this post by litkaj on the open filer forums.