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Cloned from launchpad blueprint https://blueprints.launchpad.net/glance/+spec/multi-hypervisor-cloud-support. Description: In this case client like Nova can automatically select the correct image format when it consuming an image for particular hypervisor, for example KVM images could potentially be stored on GlusterFS supported for KVM compute nodes whereas ESX images could be stored in a NFS storage. IMO Having multi-hypervisor Clouds is an important use case to us. This enhancement can help improve Cloud deployment flexibility for Cloud owner and operator, and also provide VM more faster for end user. Overall seems we have two way can go currently: 1. We implement that base on multi-location mechanism, to move 'disk_format', 'container_format' and 'checksum', 'size' property to location from image entry. 2. Add a new function like image-group, i.e., a set of (current style) images, each of which could have different format specifications. End user could create an image-group now by putting a specific tag on all the images in the group. Specification URL (additional information): None