Description of problem: Trying to extend a storage domain by adding a lun on an iscsi server fails with; 2013-07-05 00:00:51,510 ERROR [org.ovirt.engine.core.bll.storage.ConnectAllHostsToLunCommand] (http-/0.0.0.0:8443-6) [422c5cb6] Transaction rolled-back for command: org.ovirt.engine.core.bll.storage.ConnectAllHostsToLunCommand. 2013-07-05 00:00:51,540 WARN [org.ovirt.engine.core.bll.storage.ExtendSANStorageDomainCommand] (http-/0.0.0.0:8443-6) [422c5cb6] CanDoAction of action ExtendSANStorageDomain failed. Reasons:VAR__TYPE__STORAGE__DOMAIN,VAR__ACTION__EXTEND,ERROR_CANNOT_EXTEND_CONNECTION_FAILED,$lun See the next bug comment for details. Version-Release number of selected component (if applicable): RHEV-M: 3.1.2 (rhevm-3.1.0-43) Hosts: RHEL6.4 vdsm-4.10.2-1.13 libvirt-0.10.2-18.el6_4.5 How reproducible: This has happened twice now trying a attach the same lun. Steps to Reproduce: 1. 2. 3. Actual results: The lun cannot be added to the storage domain. Expected results: The lun can be added to the storage domain. Additional info: