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[Shuangtai Tian <shuangtai.tian@xxxxxxxxx>]

Public bug reported:

When old flavor's root_gb is not equal 0 and new flavor's root_gb is 0,
the resize() in nova.compute.api will raise CannotResizeDisk.

https://github.com/openstack/nova/blob/master/nova/compute/api.py#L2368

    def resize(self, context, instance, flavor_id=None,
        if not flavor_id:
            LOG.debug("flavor_id is None. Assuming migration.",
                      instance=instance)
            new_instance_type = current_instance_type
        else:
            new_instance_type = flavors.get_flavor_by_flavor_id(
                    flavor_id, read_deleted="no")
            if (new_instance_type.get('root_gb') == 0 and
                current_instance_type.get('root_gb') != 0):
                reason = _('Resize to zero disk flavor is not allowed.')
                raise exception.CannotResizeDisk(reason=reason)

** Affects: nova
     Importance: Undecided
     Assignee: Shuangtai Tian (shuangtai-tian)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Shuangtai Tian (shuangtai-tian)

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https://bugs.launchpad.net/bugs/1340159

Title:
  Resize to zero disk flavor is not allowed

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  When old flavor's root_gb is not equal 0 and new flavor's root_gb is
  0,    the resize() in nova.compute.api will raise CannotResizeDisk.

  https://github.com/openstack/nova/blob/master/nova/compute/api.py#L2368

      def resize(self, context, instance, flavor_id=None,
          if not flavor_id:
              LOG.debug("flavor_id is None. Assuming migration.",
                        instance=instance)
              new_instance_type = current_instance_type
          else:
              new_instance_type = flavors.get_flavor_by_flavor_id(
                      flavor_id, read_deleted="no")
              if (new_instance_type.get('root_gb') == 0 and
                  current_instance_type.get('root_gb') != 0):
                  reason = _('Resize to zero disk flavor is not allowed.')
                  raise exception.CannotResizeDisk(reason=reason)

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