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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Changed in: nova/pike
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => Medium

** Changed in: nova/pike
   Importance: Undecided => Medium

** Tags added: api volumes

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https://bugs.launchpad.net/bugs/1746634

Title:
  _validate_bdm not using the 'reserve_volume' Cinder API in a multi-
  cell environment

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  During instance creation, we call _validate_bdm to valid block device
  mappings boot indexes, accessibility, attachability, etc and we call
  the Cinder API to do some of that. We query the service version to
  decide which Cinder APIs to call and currently, we aren't querying all
  cells for the service version. Because we're creating an instance, we
  don't yet know what cell it will land in, so we must query all cells
  to correctly get the service version. Else, we get a service version
  of 0 and we'll use the old 'check_attach' Cinder API instead of the
  newer 'reserve_volume' API in a multi-cell environment.

  https://github.com/openstack/nova/blob/c1442d3/nova/compute/api.py#L1326

  I found this while working on improvements for the CellDatabases test
  fixture.

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