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openstack - Bad or unexpected response from the storage volume backend API

Hi, i've got a proble with cinder configuration. I have a second node provides storage through the cinder-volume service. When i want to bring up a new instance, on my second in cinder-volume.log, i have this error:

2014-09-19 11:18:56.278 3203 ERROR oslo.messaging._drivers.common [req-4777b9cc-31a1-40eb-8e11-3f96fb8c1be0 493c28fb9b774885b1580c8ef0a3c3df 502b7033a297479689d4695934dcbdfd - - -] Returning exception Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: Bad or unexpected response from the storage volume backend API: The volume driver requires the iSCSI initiator name in the connector. to caller

Have you any idea about this error please ? I am on Debian 7 with icehouse openstack Node1:controller(initiator) ; Node2:network ; Node3:Compute ; Node4:Block storage (Target)

Thanks you