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[Matt Riedemann <mriedem@xxxxxxxxxx>]

InvalidBDMVolume extends InvalidBDM which extends Invalid which is
handled in the v2 API here:

http://git.openstack.org/cgit/openstack/nova/tree/nova/api/openstack/compute/servers.py#n1007

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1368939

Title:
  server-create API doesn't handle InvalidBDM failures (v2)

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  This came up here:

  https://review.openstack.org/#/c/116837/3/nova/api/openstack/compute/plugins/v3/servers.py

  The compute API's _validate_bdm method can raise up
  CinderConnectionFailed or InvalidBDM exceptions and they aren't
  handled in the server create nova API extension.  They'll just be
  turned into 500 errors in the response.

  InvalidBDM should probably be a 400.

  CinderConnectionFailed should probably remain a 500 since we could
  fail that due to cinder being down (503), auth issues (401 or 403),
  etc.  The reason for the failure is in that exception so it's not as
  big a deal.

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