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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Adding cinder since cinder controls the volume metadata and nova
shouldn't be changing anything during live migration with respect to the
attached_mode.

** Also affects: cinder
   Importance: Undecided
       Status: New

** Tags added: live-migration volumes

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https://bugs.launchpad.net/bugs/1782714

Title:
  Properties of an attached volume are lost after live migration

Status in Cinder:
  New
Status in OpenStack Compute (nova):
  New

Bug description:
  Steps to reproduce the problem:

  1. Launch an instance.
  2. Create a volume and attach it to the instance. The volume will have "attached_mode='rw'" -property:

  [cloudadmin@controller-1 ~(admin)]$ openstack volume list --long
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+--------------------+
  | ID                                   | Name     | Status | Size | Type | Bootable | Attached to                        | Properties         |
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+--------------------+
  | 4394bec9-3b87-4a6e-b977-cb56719b0d2a | test_vol | in-use |    1 | None | false    | Attached to cirros-01 on /dev/vdb  | attached_mode='rw' |
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+--------------------+

  3. Start live migration of the instance:

  [cloudadmin@controller-1 ~(admin)]$ openstack server migrate --live
  compute-2 --block-migration cirros-01

  4. After completion of the migration volume properties are lost:

  [cloudadmin@controller-1 ~(admin)]$ openstack volume list --long
  +--------------------------------------+----------+--------+------+------+----------+----------------------------------------------------------------------+--------------------+
  | ID                                   | Name     | Status | Size | Type | Bootable | Attached to                                                          | Properties         |
  +--------------------------------------+----------+--------+------+------+----------+----------------------------------------------------------------------+--------------------+
  | 4394bec9-3b87-4a6e-b977-cb56719b0d2a | test_vol | in-use |    1 | None | false    | Attached to cirros-01 on /dev/vdb Attached to cirros-01 on /dev/vdb  | attached_mode='rw' |
  +--------------------------------------+----------+--------+------+------+----------+----------------------------------------------------------------------+--------------------+
  [cloudadmin@controller-1 ~(admin)]$
  [cloudadmin@controller-1 ~(admin)]$ openstack volume list --long
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+------------+
  | ID                                   | Name     | Status | Size | Type | Bootable | Attached to                        | Properties |
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+------------+
  | 4394bec9-3b87-4a6e-b977-cb56719b0d2a | test_vol | in-use |    1 | None | false    | Attached to cirros-01 on /dev/vdb  |            |
  +--------------------------------------+----------+--------+------+------+----------+------------------------------------+------------+
  [cloudadmin@controller-1 ~(admin)]$

  Version information:

  [cloudadmin@controller-1 ~(admin)]$ sudo rpm -qa|grep nova
  openstack-ansible-os_nova-17.0.2-1.el7.centos.ncir.2.noarch
  python-nova-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-placement-api-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-novncproxy-17.0.2-1.el7.centos.ncir.2.noarch
  nova-inventory-c2.g8617a07-1.el7.centos.ncir.noarch
  openstack-nova-scheduler-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-conductor-17.0.2-1.el7.centos.ncir.2.noarch
  python2-novaclient-10.1.0-1.el7.noarch
  openstack-nova-compute-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-api-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-common-17.0.2-1.el7.centos.ncir.2.noarch
  openstack-nova-console-17.0.2-1.el7.centos.ncir.2.noarch

  [cloudadmin@controller-1 ~(admin)]$ sudo rpm -qa|grep cinder
  python-cinder-12.0.2-2.el7.noarch
  openstack-cinder-12.0.2-2.el7.noarch
  python2-cinderclient-3.5.0-1.el7.noarch
  openstack-ansible-os_cinder-17.0.2-1.el7.centos.ncir.1.noarch
  [cloudadmin@controller-1 ~(admin)]$

  ceph: 12.2.5
  libvirt: 3.9.0

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