Cloned from launchpad blueprint https://blueprints.launchpad.net/glance/+spec/ability-to-separate-snapshots-and-images.

Description:

The main idea is that Images and Snapshots don't require the same reliability level. Basically snapshots are more criticital than images.

It depends on the Glance store used but most of them can be really flexible:

*File: could be 2 distincts directories that point to different filesystem mount points. Let's say different level of RAID for the images and the snapshots.
* Swift no use case for now since tiering doesn't exit
* S3, could point to different buckets
* RBD, one pool for the images (replica count of 2) and one pool for the snapshots (replica count of 3).

The blueprint might need to be implemented separately for each backend.

Specification URL (additional information):

None