Issue

• We have created iSCSI LUNs using targetcli and exported it to the initiator, the backstores used for LUNs were lvm volume.

  There were new PV, VG, LV created on iSCSI LUNs from initiator side. But after rebooting the target server, it was observed that target.service could not start automatically and shows errors that lvm volumes used for backstores are already in use:

  $ systemctl start target.service
  Job for target.service failed. See 'systemctl status target.service' and 'journalctl -xn' for details.
  
  # systemctl status target.service
  target.service - Restore LIO kernel target configuration
     Loaded: loaded (/usr/lib/systemd/system/target.service; enabled)
     Active: failed (Result: exit-code) since Sun 2015-01-05 10:27:12 CET; 8s ago
    Process: 1234 ExecStart=/usr/bin/targetctl restore (code=exited, status=1/FAILURE)
   Main PID: 1234 (code=exited, status=1/FAILURE)
  
  Jan 05 10:27:12 iscsihost target[1234]: errors = RTSRoot().restore_from_file(restore_file=from_file)
  Jan 05 10:27:12 iscsihost target[1234]: File "/usr/lib/python2.7/site-packages/rtslib/root.py", line 255, in restore_from_file
  Jan 05 10:27:12 iscsihost target[1234]: abort_on_error=abort_on_error)
  Jan 05 10:27:12 iscsihost target[1234]: File "/usr/lib/python2.7/site-packages/rtslib/root.py", line 189, in restore
  Jan 05 10:27:12 iscsihost target[1234]: so_obj = so_cls(**kwargs)
  Jan 05 10:27:12 iscsihost target[1234]: File "/usr/lib/python2.7/site-packages/rtslib/tcm.py", line 669, in __init__
  Jan 05 10:27:12 iscsihost target[1234]: self._configure(dev, wwn, readonly)
  Jan 05 10:27:12 iscsihost target[1234]: File "/usr/lib/python2.7/site-packages/rtslib/tcm.py", line 682, in _configure
  Jan 05 10:27:12 iscsihost target[1234]: + "device %s is already in use." % dev)         <<---------
  Jan 05 10:27:12 iscsihost target[1234]: rtslib.utils.RTSLibError: Cannot configure StorageObject because device /dev/mapper/vgtarget-lvlun1 i...dy in use.      <<---------
  Jan 05 10:27:12 iscsihost systemd[1]: target.service: main process exited, code=exited, status=1/FAILURE
  Jan 05 10:27:12 iscsihost systemd[1]: Failed to start Restore LIO kernel target configuration.
  Jan 05 10:27:12 iscsihost systemd[1]: Unit target.service entered failed state.
  Hint: Some lines were ellipsized, use -l to show in full.