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[norman shen <1836681@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

we are using OpenStack Queens: 
nova-common/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed]
nova-compute/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed,automatic]
nova-compute-kvm/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed]

guest vm uses windows 2012 datacenter edition

after successfully executing openstack server add volume ${instance_id}
${volume_id}, we observe volume status has changed to in-used and
attachments info are correctly stored in both nova and neutron. But
device does not show up in guest machine.

we execute `virsh dumpxml ${instance_id}` but device is not there. We
then try to edit directly by executing `virsh edit ${instance_id}` and
we see the device with proper attachments info...

At last we have to shutdown the vm and boot again to solve the problem.


command line outputs are put below,

/var/lib/libvirt/qemu# virsh dumpxml 55 --inactive
....
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='writeback' discard='unmap'/>
      <target dev='vdc' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </disk>
.....

# virsh domblklist 55
Target     Source
------------------------------------------------
vda        vms/xxx
vdb        vms/xxxx

manually attach vdc reports `vdc` in-used

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1836681

Title:
  attach volume succeeded but device not found on guest machine

Status in OpenStack Compute (nova):
  New

Bug description:
  we are using OpenStack Queens: 
  nova-common/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed]
  nova-compute/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed,automatic]
  nova-compute-kvm/xenial,now 2:17.0.9-6~u16.01+mcp189 all [installed]

  guest vm uses windows 2012 datacenter edition

  after successfully executing openstack server add volume
  ${instance_id} ${volume_id}, we observe volume status has changed to
  in-used and attachments info are correctly stored in both nova and
  neutron. But device does not show up in guest machine.

  we execute `virsh dumpxml ${instance_id}` but device is not there. We
  then try to edit directly by executing `virsh edit ${instance_id}` and
  we see the device with proper attachments info...

  At last we have to shutdown the vm and boot again to solve the
  problem.

  
  command line outputs are put below,

  /var/lib/libvirt/qemu# virsh dumpxml 55 --inactive
  ....
      <disk type='network' device='disk'>
        <driver name='qemu' type='raw' cache='writeback' discard='unmap'/>
        <target dev='vdc' bus='virtio'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
      </disk>
  .....

  # virsh domblklist 55
  Target     Source
  ------------------------------------------------
  vda        vms/xxx
  vdb        vms/xxxx

  manually attach vdc reports `vdc` in-used

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