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[Ryan McNair <rdmcnair@xxxxxxxxxx>]

Public bug reported:

Description
=======================
Using "nova volume update" will only succeed the first time when called on a particular connection.

Steps to Reproduce
=======================
This was found while creating test coverage for swap volume, so the exact reproduce steps are in the Tempest test https://review.openstack.org/#/c/258593/, but to sum it up

1) Create server
2) Create vol A and attach to server
3) Create vol B
4) nova volume update server <A> <B>
5) nova volume update server <B> <A>  (this will fail

Expected Result
=====================
Should be able to swap two volumes, then swap them back to get to the original state

Actual Result
=====================
After swapping two volumes, any attempt to swap them back will fail while grabbing the BDM (https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L1414)

** Affects: nova
     Importance: Undecided
     Assignee: Ryan McNair (rdmcnair)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Ryan McNair (rdmcnair)

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https://bugs.launchpad.net/bugs/1569419

Title:
  Nova volume update fails if swapping a volume more than once on the
  same connection

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  =======================
  Using "nova volume update" will only succeed the first time when called on a particular connection.

  Steps to Reproduce
  =======================
  This was found while creating test coverage for swap volume, so the exact reproduce steps are in the Tempest test https://review.openstack.org/#/c/258593/, but to sum it up

  1) Create server
  2) Create vol A and attach to server
  3) Create vol B
  4) nova volume update server <A> <B>
  5) nova volume update server <B> <A>  (this will fail

  Expected Result
  =====================
  Should be able to swap two volumes, then swap them back to get to the original state

  Actual Result
  =====================
  After swapping two volumes, any attempt to swap them back will fail while grabbing the BDM (https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L1414)

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