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[Anselm Busse <anselm.busse@xxxxxxxxxxx>]

Public bug reported:

I am using a Nova version 2014.2.2 setup with VirtIO. I am trying to
attach a volume via VirtIO driver to a machine with an ISO boot image.
However, nova does not create a configuration for the volume attaching
it via VirtIO but rather via IDE. The following steps are causing the
problem.

First I create a new instance, which works fine:

nova boot --flavor 1 --image gentoo.iso --nic net-id=bea32667-0d4d-4546
-877a-9cff5551d164 test-vm

Then I try to attach a volume via VirtIO. I will explain, why I use vdb
later:

nova volume-attach test-vm 28c2ce69-4430-4216-8758-3fe4a3d8d322 /dev/vdb

The volume is then attached as /dev/hdb to the instance instead of
/dev/vdb. The log shows the following:

2015-02-25 16:44:04.028 10549 DEBUG nova.compute.utils [req-934ddef9
-103a-4ad0-b05c-12f0857b9174 None] Using /dev/hd instead of /dev/vd
get_next_device_name /usr/lib64/python2.7/site-
packages/nova/compute/utils.py:174

When I try to attach the volume to /dev/vda it fails completely, because
then Nova tries to attach it to /dev/hda that it assumes to be already
occupied by the cdrom emulation with the ISO image.

I looked into the utils.py file and could not really figure out the
reason why the prefix is created based on the root device name. So I am
not sure whether this is a bug or intended functionality. In the latter
case I would appreciate an explanation especially how to enforce the
attachment via VirtIO only for the one device in question.

Thank you and best regards

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1425583

Title:
  Volume cannot be attached via VirtIO while batting from ISO

Status in OpenStack Compute (Nova):
  New

Bug description:
  I am using a Nova version 2014.2.2 setup with VirtIO. I am trying to
  attach a volume via VirtIO driver to a machine with an ISO boot image.
  However, nova does not create a configuration for the volume attaching
  it via VirtIO but rather via IDE. The following steps are causing the
  problem.

  First I create a new instance, which works fine:

  nova boot --flavor 1 --image gentoo.iso --nic net-
  id=bea32667-0d4d-4546-877a-9cff5551d164 test-vm

  Then I try to attach a volume via VirtIO. I will explain, why I use
  vdb later:

  nova volume-attach test-vm 28c2ce69-4430-4216-8758-3fe4a3d8d322
  /dev/vdb

  The volume is then attached as /dev/hdb to the instance instead of
  /dev/vdb. The log shows the following:

  2015-02-25 16:44:04.028 10549 DEBUG nova.compute.utils [req-934ddef9
  -103a-4ad0-b05c-12f0857b9174 None] Using /dev/hd instead of /dev/vd
  get_next_device_name /usr/lib64/python2.7/site-
  packages/nova/compute/utils.py:174

  When I try to attach the volume to /dev/vda it fails completely,
  because then Nova tries to attach it to /dev/hda that it assumes to be
  already occupied by the cdrom emulation with the ISO image.

  I looked into the utils.py file and could not really figure out the
  reason why the prefix is created based on the root device name. So I
  am not sure whether this is a bug or intended functionality. In the
  latter case I would appreciate an explanation especially how to
  enforce the attachment via VirtIO only for the one device in question.

  Thank you and best regards

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