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[Takashi NATSUME <natsume.takashi@xxxxxxxxxxxxx>]

Liberty is already EOL and this bug report has been 'In Progress' status for a year, but there is no activity. So set it to 'Invalid' status.
This bug can be reopened (set back to "New") if someone reproduce the bug at newton, ocata or master.


** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1575233

Title:
  target-lun 0 can be delete when detaching volume.

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  target-lun 0 can delete when detaching volume.

  Environment
  ===========
  - OpenStack Release : Liberty
  - OS : Ubuntu 14.04.2 LTS
  - Hypervisor : KVM
  - Cinder Storage : iSCSI (EMC VNX)

  Description
  ===========
  I am using EMC Storage as volume backend.
  Recently, I discovered problem logic when detaching volume.
  As you know, nova-compute try to delete device and mapper of detaching volume.

  AFAIK, EMC Storage has lun-0 device in compute node.

  $ls -al /dev/disk/by-path/*lun-0
  lrwxrwxrwx 1 root root 9 Feb 24 20:05 ip-x.x.x.x:3260-iscsi-iqn.1992-04.com.emc:cx.ckm00142100690.a0-lun-0 -> ../../sdd
  lrwxrwxrwx 1 root root 9 Feb 24 20:05 ip-x.x.x.x:3260-iscsi-iqn.1992-04.com.emc:cx.ckm00142100690.b0-lun-0 -> ../../sde
  lrwxrwxrwx 1 root root 9 Feb 24 20:05 ip-x.x.x.x:3260-iscsi-iqn.1992-04.com.emc:cx.ckm00142100690.a1-lun-0 -> ../../sdi
  lrwxrwxrwx 1 root root 9 Feb 24 20:05 ip-x.x.x.x:3260-iscsi-iqn.1992-04.com.emc:cx.ckm00142100690.b1-lun-0 -> ../../sdh

  But nova-compute can delete device of lun-0 when failing to get
  'target_lun'

  https://github.com/openstack/nova/blob/stable/kilo/nova/virt/libvirt/volume.py
      def _delete_mpath(self, iscsi_properties, multipath_device, ips_iqns):
          entries = self._get_iscsi_devices()
          # Loop through ips_iqns to construct all paths
          iqn_luns = []
          for ip, iqn in ips_iqns:
              iqn_lun = '%s-lun-%s' %
                  (iqn,iscsi_properties.get('target_lun', 0))    <-- return 0 (lun-id) when getting value of 'target_lun'

  i think that it needs to modify that code.

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