On Fri, 12 Oct 2018 21:50:27 +0000, Eugen Block wrote:
I would consider this thread as closed. After I learned that nova imports flat images if the image's disk-format is not "raw" I tested some different scenarios to understand more about this topic. I still couldn't explain why nova did that in the specific case as I was sure the image's format was raw (the image has been deleted in the meantime but I can see in the database that the image's disk-format was indeed "raw").
Thanks for sharing that info. The reason I suggested that maybe the original image wasn't created with 'raw' format (example, with 'qemu-img create -f raw ...') was because I have made that mistake before in the past. :P It is possible to upload an image to glance that is not format 'raw' and also specify to glance that it _is_ indeed 'raw' (I used the openstack CLI when I did the image upload). In that case, you will see nova download the image instead of doing ceph CoW clone.
But a couple of days ago I encountered the same problem. I tried to upload an image from volume via Horizon dashboard (where a dropdown exists to choose disk-format) and the preselected value was indeed "qcow2" instead of "raw". I have no idea*why* it was different from the default "raw" but this could have happened last week, too, althoug according to the database entry it should not have happened. Anyway, now I know the reason why some ephemeral disks are flat, I just can't tell how Horizon selects the format, but that's enough research for now. If I find out more I'll report back.
Sure, let us know if you notice anything else unusual. Cheers, -melanie _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
