And hence my confusion... LOL During install (per: http://docs.openstack.org/grizzly/basic-install/apt/content/index.html) It shows to use tgtadm as iscsi helper, but instructions install iscsitarget.

Per this troubleshooting post(https://ask.openstack.org/en/question/130/why-do-i-get-no-portal-found-error-while-attaching-cinder-volume-to-vm/) it says I should only be using iscsitarget or tgt not both.

After I update iscsi_helper from tgtadm to ietadm it started working. So wanted clarification how it should be set up.

What I do (and it has worked for me pretty well) is to connect to the LUN with iscsiadm, run pvcreate on it and extend the vg cinder-volumes (or whatever vg you're using with the cinder) with the new pv.

Just to confirm, it sounds like the only time that ISCSI or tgt is used is calling to the cinder volume? Are the connectors not used at all when creating instances?