According to my understanding the Compute node receives the Image from glance and then that image is stored in the cache and served as base to make other instances from it (stored in "/var/lib/nova/instances/_base") directory. Now if i want to overcome the overhead of downloading the image from glance and place the image on compute node (like pre-configured compute node) to start making VMs using that image, (because in my case the image size is really big and i don't need an overhead due to slow internet to make things slower). Would that serve the purpose. I don't want the glance to download the image as that would take time. so i want to place the image on compute server to overcome that delay. Can anybody suggest any optimizations or way to achieve this?