1. Proposed title of this feature request
   2. What is the nature and description of the request?
   3. Why does the customer need this? (List the business requirements here)
   4. List any affected packages or components.

What is the nature and description of the request?

Customers are in need to be able to change the current glance image storage backend to a different one, such as from CEPH to S3. This should be possible for existing installations where changing backends is currently not supported by Red Hat.

• Change the current CEPH backend to S3 for an existing installation.
• A clear way to migrate the images is present and documented.
• Impact on existing workload is minimal.

Why does the customer need this?

Customer is using CEPH only as a Glance image backend and would like to consolidate/move away from CEPH for it.

Additional Information:

From discussions about this issue, the following high-level steps where discussed:

• Enabling multistore to mirror images
• Enable copy_image import method
• Copy image from CEPH to S3 which will keep same image id and properties
• Delete image from CEPH
• Remove CEPH backend from configuration
• To actually copy image a command as follows could be possible:
  • glance image-import --import-method copy-image --stores store1,store2 image-id