通过open-iscsi无法自动挂载

[ps3wifi]

服务器安装的iscsitarget后,windows可以通过iscsi客户端实现自动挂载iscsi盘,但是ubuntu系统安装open-iscsi后无法自动挂载
iscsiadm -m node -T iqn.xxx -p san_ip -l加载成功后按照网上案例
iscsiadm -m node -T iqn.xxx -p san_ip --op update -n node.startup -v automatic执行没有任何错误提示
修改fstab
UUID=xxxx /iscsi ext4 defaults,_netdev 0 0
重新启动后,不能自动挂载iscsi盘
麻烦问下各位高手这个该怎么解决?
日志也显示这个错误
Apr 7 15:39:46 mail iscsid: Connection1:0 to [target: iqn.2016-03.com.example:storage.iscsi-data, portal: 192.168.118.15,3260] through [iface: default] is operational now
Apr 7 15:39:46 mail systemd[1]: Mounting /iscsi...
Apr 7 15:39:46 mail systemd[1]: Mounted /iscsi.
Apr 7 15:40:06 mail systemd[1]: Unmounting /iscsi...
Apr 8 15:41:26 mail systemd[1]: Dependency failed for /iscsi.
Apr 8 15:41:26 mail systemd[1]: iscsi.mount: Job iscsi.mount/start failed with result 'dependency'.
Apr 8 15:41:26 mail open-iscsi[991]: * Starting iSCSI initiator service iscsid
Apr 8 15:41:26 mail iscsid: iSCSI logger with pid=1025 started!
Apr 8 15:41:26 mail open-iscsi[991]: ...done.
Apr 8 15:41:26 mail open-iscsi[991]: * Setting up iSCSI targets
Apr 8 15:41:26 mail iscsid: iSCSI daemon with pid=1026 started!
Apr 8 15:41:26 mail iscsid: connect to 192.168.118.15:3260 failed (Connection refused)
Apr 8 15:41:26 mail iscsid: message repeated 30 times: [ connect to 192.168.118.15:3260 failed (Connection refused)]