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The issue was somehow my fault. While using a rbd storage backend it is highly recommended to set the

show_image_direct_url = True

in the glance-api.conf. With this option the image is copied directly by the rbd store and the finally the volume creation only takes a couple of seconds. Now the instantiation of multiple instances and of very big images is no longer a problem.

Greets Stefan

The issue was somehow my fault. While using a rbd storage backend it is highly recommended to set the

show_image_direct_url = True

in the glance-api.conf. With this option the image is copied directly by the rbd store and the finally the volume creation creation/image copy only takes a couple of seconds. Now the instantiation of multiple instances and of very big images is no longer a problem.

Greets Stefan

The issue was somehow my fault. While using a rbd storage backend it is highly recommended to set the

show_image_direct_url = True

option in the glance-api.conf. With this option the image is copied directly by the rbd store and finally the volume creation/image copy only takes a couple of seconds. Now the instantiation of multiple instances and of very big images is no longer a problem.

Greets Stefan