This error may be caused by a volume being exported outside of OpenStack using a host name different from the system name that OpenStack expects. This error could be displayed with the IQN if the host was exported using iSCSI.
Duplicate3PARHost: 3PAR Host already exists: Host wwn 50014380242B9750 already used by host cld4b5ubuntuW(id = 68. The hostname must be called 'cld4b5ubuntu‘.
