I've got some problems with my ovirt-engine. Currently I have one iscsi storage volume and I want add a second one. The second has the same configuration as the first. In my engine I can log into the iSCSI but I cannot see the LUN. Ovirt gives me this message :

2013-06-17 15:50:04,013 ERROR [org.ovirt.engine.core.bll.storage.DiscoverSendTargetsQuery] (ajp--127.0.0.1-8702-9) Query DiscoverSendTargetsQuery failed. Exception message is VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed in vdscommand to DiscoverSendTargetsVDS, error = Failed discovery of iSCSI targets: "portal=IscsiPortal(hostname='iscsi-1.example.com', port=3260), err=(5, [], ['iscsiadm: Connection to Discovery Address 192.168.0.98 closed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: Connection to Discovery Address 192.168.0.98 closed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: Connection to Discovery Address 192.168.0.98 closed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: Connection to Discovery Address 192.168.0.98 failed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: Connection to Discovery Address 192.168.0.98 failed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: Connection to Discovery Address 192.168.0.98 closed', 'iscsiadm: Login I/O error, failed to receive a PDU', 'iscsiadm: retrying discovery login to 192.168.0.98', 'iscsiadm: connection login retries (reopen_max) 5 exceeded', 'iscsiadm: Could not perform SendTargets discovery: encountered iSCSI login failure'])"
2013-06-17 15:54:03,649 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.DiscoverSendTargetsVDSCommand] (ajp--127.0.0.1-8702-3) START, DiscoverSendTargetsVDSCommand(HostName = hosts-1.example.com, HostId = 1c8e67de-c355-4b07-a09f-c58d08115e1e, connection={ id: null, connection: iscsi-1.example.com, iqn: null, vfsType: null, mountOptions: null, nfsVersion: null, nfsRetrans: null, nfsTimeo: null };), log id: 3dca76fc