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Please, view
1. OpenStack Documentation Configure a Block Storage Service controller : http://docs.openstack.org/havana/install-guide/install/apt/content/cinder-controller.html
2. OpenStack Documentation Configure a Block Storage Service node : http://docs.openstack.org/havana/install-guide/install/apt/content/cinder-node.html

ISCSI Target host is supposed to run service target && utlity targetcli on modern systems (CentOS 7, F21)
iSCSI Initiator host is supposed to run service iscsid to detect LVMiSCSI targets , located on Storage Node - iSCSI Target Host, iSCSI initiator host is your Compute Node (Nodes)
A sample of tuning simple TwoNode Cluster I posted here http://lxer.com/module/newswire/view/209622/index.html for F21
and here http://lxer.com/module/newswire/view/207624/index.html for CentOS 7
Cinder configuration is explained in details in both posts mentioned above, it also differs very much on modern systems running Juno from IceHouse

Please, view
1. OpenStack Documentation Configure a Block Storage Service controller : http://docs.openstack.org/havana/install-guide/install/apt/content/cinder-controller.html
2. OpenStack Documentation Configure a Block Storage Service node : http://docs.openstack.org/havana/install-guide/install/apt/content/cinder-node.html

ISCSI iSCSI Target host is supposed to run service target && utlity targetcli on modern systems (CentOS 7, F21)
iSCSI Initiator host is supposed to run service iscsid to detect LVMiSCSI targets , located on Storage Node - iSCSI Target Host, iSCSI initiator host is your Compute Node (Nodes)
A sample of tuning simple TwoNode Cluster I posted here http://lxer.com/module/newswire/view/209622/index.html for F21
F21 and here http://lxer.com/module/newswire/view/207624/index.html for CentOS 7
iSCSI Target Host is the node (storage node) hosting your cinder back end LVMs

Cinder configuration is explained in details in both posts mentioned above, it also differs very much on modern systems running Juno from IceHouse