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  1. Bug #1733450
  2. Comment #2

Comment 2 for bug 1733450

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Dmitry Sutyagin (dsutyagin) wrote : Re: Create Volume from a snapshot-backed Glance image fails (with Ceph backend)

Looks like it's indeed an issue in Horizon (or Glance?).
Here is how requests to Cinder API look like:
 - VM is spawn from image with Create a new Volume: http://paste.openstack.org/show/626882/
 - Create Volume is used on Images tab: - http://paste.openstack.org/show/626881/

In the first case Cinder gets request about a specific snapshot straight away. Not sure where this data comes from, maybe Horizon requests meta from Glance first and finds block_device_mapping meta. Then in the end we can see that Cinder gets a POST request with this snapshot id, and creates a volume from this snapshot, does not touch the image at all (seems so).

In the second case Cinder gets a lot of requests, some for snapshots (but no specific one), and in the end we see a POST request to Cinder without the snapshot id, which causes Cinder to create a new volume not from snapshot but from image, and fail.