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[Lucian Petrut <lpetrut@xxxxxxxxxxxxxxxxxxxxxx>]

Public bug reported:

When using separate databases for each Nova cell, nova assisted volume snapshots always fail with the following error:
BadRequest: No volume Block Device Mapping with id a10bd120-9b88-4710-bf6e-f1d34de87da2. (HTTP 400)

The reason is that the according API call does not include an instance
id, which is fetched from the BDM. At the same time, the BDM cannot
properly be retrieved since Nova doesn't know which cell to use, looking
for the BDM in the wrong DB.

Cinder trace: http://paste.openstack.org/raw/619767/

Among others, Cinder NFS backends are affected by this, as per the following Cinder NFS CI logs:
http://logs.openstack.org/21/498321/5/check/gate-tempest-dsvm-full-devstack-plugin-nfs-nv/b8bca96/logs/screen-c-vol.txt.gz?level=ERROR

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: api cells volumes

** Tags added: api cells volumes

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https://bugs.launchpad.net/bugs/1713735

Title:
  Nova assisted volume snapshots issue

Status in OpenStack Compute (nova):
  New

Bug description:
  When using separate databases for each Nova cell, nova assisted volume snapshots always fail with the following error:
  BadRequest: No volume Block Device Mapping with id a10bd120-9b88-4710-bf6e-f1d34de87da2. (HTTP 400)

  The reason is that the according API call does not include an instance
  id, which is fetched from the BDM. At the same time, the BDM cannot
  properly be retrieved since Nova doesn't know which cell to use,
  looking for the BDM in the wrong DB.

  Cinder trace: http://paste.openstack.org/raw/619767/

  Among others, Cinder NFS backends are affected by this, as per the following Cinder NFS CI logs:
  http://logs.openstack.org/21/498321/5/check/gate-tempest-dsvm-full-devstack-plugin-nfs-nv/b8bca96/logs/screen-c-vol.txt.gz?level=ERROR

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