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On 8/7/15, 1:07 PM, "Jay Pipes" <jaypipes at gmail.com> wrote:

>So, here's the crux of the issue. Nova and Cinder **do not want to speak
>the Glance REST API** to either upload or download image bits from
>storage. Streaming image bits through the Glance API endpoint is a
>needless and inefficient step, and Nova and Cinder would like to
>communicate directly with the backend storage systems.

Exactly why do you want to communicate directly with the backend storage
systems?  Streaming image bits through Glance appears to be "needless and
inefficient", but if an end-user is booting 1K instances from some custom
image, Glance's image cache makes an enormous difference in delivery time.

So I'm curious about what exactly the use cases for direct backend storage
communication are, and why Glance can't meet them.

cheers,
brian