On 08/11/15 at 01:42pm, Brian Rosmaita wrote:
On 8/7/15, 1:07 PM, "Jay Pipes" <jaypi...@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.
Glance's image cache makes a big difference if the backend store has
higher latency or less bandwidth than the Glance nodes themselves, but
that will not always be the case. And, AFAIK, it only allows for HTTP
transfers of images and there are setups that would benefit from being
able to grab the image via a different protocol.
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
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