Comment 15 for bug 1196666

Haomai> I mean the other way around, ie, turning off "glance_api_version=2" will make the error go away and "upload-to-image" will work. It is a must thing for CoW cloning feature to function with ceph backend. It is not a must if you don't need the CoW cloning when creating cinder volumes.

Zhiteng> From the debug output, I can see glance_api_version 2 didn't implement image_create call. When you execute the "upload-to-image" from cinder CLI, it calls glance_api to create/register image in glance, with version 2 glance_api, it will fail since the create function is not yet implemented. Hopefully this make sense.