iSCSI over RBD

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Hello folks,
  I am trying to share my ceph rbd images through iscsi protocol.

I am trying iscsi-gateway 


now 

systemctl start rbd-target-api
is working and I could run gwcli
(at a CentOS 7.4 osd node)

gwcli
/> ls
o- / ......................................................................................................................... [...]
  o- clusters ........................................................................................................ [Clusters: 1]
  | o- ceph ............................................................................................................ [HEALTH_OK]
  |   o- pools .......................................................................................................... [Pools: 1]
  |   | o- rbd ........................................................................... [(x3), Commit: 0b/25.9T (0%), Used: 395M]
  |   o- topology ................................................................................................ [OSDs: 9,MONs: 3]
  o- disks .......................................................................................................... [0b, Disks: 0]
  o- iscsi-target ..................................................................................................... [Targets: 0]


but when I created iscsi-target, I got

Local LIO instance already has LIO configured with a target - unable to continue


/> /iscsi-target create iqn.2003-01.org.linux-iscsi.ceph-node1.x8664:sn.571e1ab51af2
Local LIO instance already has LIO configured with a target - unable to continue
/> 

and no more progress at all,

is there something I need to check? something missing? or please direct me for further debugging.

Thanks in advance

Cheers
Joshua

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