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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

** No longer affects: nova

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https://bugs.launchpad.net/bugs/1744999

Title:
  Horizon incorrectly checks for flavor disk if volume-based instance is
  being created

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  
  Description
  ===========

  When creating a new VM through Horizon, it validates that its disk
  size is less than the flavor disk one. Such check doesn't make sense
  when creating a volume-based instance - either via image2volume
  process or by using previously existing image.

  There are no such restrictions in Nova for quite a while.

  - check in Horizon:
  https://github.com/openstack/horizon/blob/67eba6443900654b5c70501553e65ddb48f33bad/openstack_dashboard/dashboards/project/static/dashboard/project/workflow
  /launch-instance/flavor/flavor.controller.js#L382

  - fixed bug with incorrect behaviour in Nova (in Kilo version):
  https://bugs.launchpad.net/nova/+bug/1457517

  Steps to reproduce
  ==================

  1. Create an image A with min_size of 50GB
  2. Create a flavor B with disk size of 20GB
  3. Try to create an instance C using boot source "image A" and requesting to create a new volume.
  4. Select flavor B as a flavor.

  Expected result
  ===============

  Instance creation succeeds.

  Actual result
  =============

  Warning is shown, instance creation button is disabled.

  Environment
  ===========

  OpenStack Pike.

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