Folks,

I have two openstack clouds and both have their own Ceph backend storage.I am trying to migrate instances from openstack A to openstack B.

1. Take a snapshot from A

2. Export snapshot and import to B

3. Create instance on B

4. Delete snapshot - (I am getting error because its in-use)

Because it has a parent reference to that volume. How do I remove the reference so it will let me delete a snapshot. Reason I am asking is because I have so many VMs to migrate and don't want glance to have 100s of entities in those snapshots.

What is the alternative here? I can try qcow2 if that is the final solution to make it clean.

# rbd -p volumes info volume-f2b2aec2-cc57-49e5-aca1-54b5a7ee9f3a
rbd image 'volume-f2b2aec2-cc57-49e5-aca1-54b5a7ee9f3a':
	size 40 GiB in 5120 objects
	order 23 (8 MiB objects)
	snapshot_count: 0
	id: 5473c827864fed
	block_name_prefix: rbd_data.5473c827864fed
	format: 2
	features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
	op_features:
	flags:
	create_timestamp: Fri Jan 19 19:03:25 2024
	access_timestamp: Wed Jan 24 15:51:04 2024
	modify_timestamp: Wed Jan 24 15:52:40 2024
	parent: images/3708f961-fb74-49f1-ab9b-40cf7954abed@snap
	overlap: 40 GiB