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[OpenStack Infra <1608934@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/355415
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=d0775c50d0c2bd50a62ccd49ea7063948af6c3b3
Submitter: Jenkins
Branch:    master

commit d0775c50d0c2bd50a62ccd49ea7063948af6c3b3
Author: Jens Rosenboom <j.rosenboom@xxxxxxxx>
Date:   Mon Aug 15 13:16:58 2016 +0200

    Fix resizing in imagebackend.cache()
    
    The Flat and Lvm backends do not create a 'base image' (the file in the
    image cache) when creating an ephemeral or swap disk. However, cache()
    expects it to exist when checking if a resize is required.
    
    This change ignores the resize check if the backing file doesn't exist.
    This happens to be ok, because ephemeral and swap disks are always
    created with the correct target size anyway, and therefore never need
    to be resized.
    
    Closes-Bug: 1608934
    Co-Authored-By: Matthew Booth <mbooth@xxxxxxxxxx>
    Change-Id: I46b5658efafe558dd6b28c9910fb8fde830adec0


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1608934

Title:
  ephemeral/swap disk creation fails for local storage with image type
  raw/lvm

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive liberty series:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive newton series:
  Triaged
Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) mitaka series:
  In Progress
Status in nova package in Ubuntu:
  Triaged

Bug description:
  Description
  ===========
  I am currently trying to launch an instance in my mitaka cluster with a flavor with ephemeral and root storage. Whenever i am trying to start the instance i am running into an "DiskNotFound" Error (see trace below). Starting instances without ephemeral works perfectly fine and the root disk is created as expected in /var/lib/nova/instance/$INSTANCEID/disk .

  Steps to reproduce
  ==================
  1. Create a flavor with ephemeral and root storage.
  2. Start an instance with that flavor.

  Expected result
  ===============
  Instance starts and ephemeral disk is created in /var/lib/nova/instances/$INSTANCEID/disk.eph0 or disk.local ? (Not sure where the switchase for the naming is)

  Actual result
  =============
  Instance does not start, ephemeral disk seems to be created at /var/lib/nova/instances/$INSTANCEID/disk.eph0, but nova checks /var/lib/nova/instances/_base/ephemeral_* for disk_size

  TRACE: http://pastebin.com/raw/TwtiNLY2

  Environment
  ===========
  I am running OpenStack mitaka on Ubuntu 16.04 in the latest version with Libvirt + KVM as hypervisor (also latest stable in xenial).

  Config
  ======

  nova.conf:

  ...
  [libvirt]
  images_type = raw
  rbd_secret_uuid = XXX
  virt_type = kvm
  inject_key = true
  snapshot_image_format = raw
  disk_cachemodes = "network=writeback"
  rng_dev_path = /dev/random
  rbd_user = cinder
  ...

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