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[melanie witt <1898168@xxxxxxxxxxxxxxxxxx>]

Thank you Tony, I'm closing this as Invalid based on your findings.
Please feel free to reopen if you find there is an issue with nova.
Cheers.

** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1898168

Title:
  Cannot create more than one instance when using RAW image with rbd
  imagebackend

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========
  When using rbd as the nova and glance store backend with a RAW image, creating an instance will directly clone the image from glance. It is then impossible to create a second instance from this RAW image.

  I don't know if it's a bug or a configuration error on my part.

  Note with the image property 'img_linked_clone' I could have worked around this problem
  image property named 'img_linked_clone' => https://bugs.launchpad.net/nova/+bug/1697391

  Steps to reproduce
  ==================
  A chronological list of steps which will bring off the
  issue you noticed:
  1. Use rbd as the nova and glance backend.
  2. Upload a RAW image.
  3. Use this image to create a first instance
  4. Use this image again to create a second instance

  Expected result
  ===============
  The second instance should be active like the first

  Actual result
  =============
  Creation of second instance fails. 
  The first instance has directly cloned the image.

  
  * Glance rbd image information :

  rbd info glance/86ae5d55-afc7-48d4-8298-f5d974662922
  	size 10 GiB in 1280 objects
  	order 23 (8 MiB objects)
  	snapshot_count: 1
  	id: e504021b348f19
  	block_name_prefix: rbd_data.e504021b348f19
  	format: 2
  	features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, operations
  	op_features: clone-parent, snap-trash
  	flags: 
  	create_timestamp: Fri Oct  2 08:04:13 2020
  	access_timestamp: Fri Oct  2 08:04:13 2020
  	modify_timestamp: Fri Oct  2 08:07:16 2020

  * Nova rbd image information :

  rbd info vms/cabe736a-ce62-437e-b56b-e073ba001c35_disk
  	size 20 GiB in 2560 objects
  	order 23 (8 MiB objects)
  	snapshot_count: 0
  	id: e51e01344f07ed
  	block_name_prefix: rbd_data.e51e01344f07ed
  	format: 2
  	features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, operations
  	op_features: clone-child
  	flags: 
  	create_timestamp: Fri Oct  2 08:08:26 2020
  	access_timestamp: Fri Oct  2 09:42:02 2020
  	modify_timestamp: Fri Oct  2 09:49:42 2020
  	parent: glance-images/86ae5d55-afc7-48d4-8298-f5d974662922@cdb63293-4620-4e50-b0e8-eb5386c4208d
  	overlap: 10 GiB

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
     list for all releases: http://docs.openstack.org/releases/

     "Train" with a kolla-ansible deployment

  2. Which hypervisor did you use?

     libvirt + kvm + rbd

  2. Which storage type did you use?

     ceph

  3. Which networking type did you use?

     N/A

  Kolla-ansible with rbd（Train)

  Logs & Configs
  ==============

  [libvirt]
  connection_uri = qemu+tcp://192.168.1.14/system
  live_migration_inbound_addr = 192.168.1.14
  rbd_secret_uuid = 1706e3a9-c53e-4b2b-8474-b1d601db4770
  virt_type = kvm
  images_rbd_pool = vms
  images_type = rbd
  images_rbd_ceph_conf = /etc/ceph/ceph.conf
  rbd_user = nova
  disk_cachemodes = network=writeback
  hw_disk_discard = unmap
  live_migration_bandwidth = 1000
  inject_key = false
  inject_password = False
  inject_partition = -2

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