It's a cluster id, it can be specified, but it's not necessary. Glance store creates these url by default.
"rbd://647f7ae8-648a-44f5-83ad-f7bd2299274e/images/2e4b6dca-9700-4715-b81d-4463cd7038de/snap" and "rbd://2e4b6dca-9700-4715-b81d-4463cd7038de" are equal.
It's a cluster id, it can be specified, but it's not necessary. Glance store creates these url by default.
"rbd:// 647f7ae8- 648a-44f5- 83ad-f7bd229927 4e/images/ 2e4b6dca- 9700-4715- b81d-4463cd7038 de/snap" and "rbd:// 2e4b6dca- 9700-4715- b81d-4463cd7038 de" are equal.