brief open-iscsi target set up.
install open-iscsi, make sure support is available in kernel, and start any iscsi services.
then the following:
iscsiadm -m discovery -t st -p IP_ADDRESS iscsiadm -m node iscsiadm -m node -T IQN_FROM_ABOVE -p IP_ADDRESS:PORT --login
should give you some output on dmesg or fdisk -l
to disconnect the drive, umount first then:
iscsiadm -m node -T IQN_FROM_ABOVE -p IP_ADDRESS:PORT --logout