Hey!

We’re looking into deploying a cloud with a mix of VM and baremetal hosts (nova-compute vs ironic), and discovered some tension between the recommendations for glance for each case. At scale, ironic seems to recommend usage of the swift backend to remove the conductor as a bottleneck when streaming disk images, but for KVM usage, the RBD backend allows for faster launches by cloning the source image.

Any thoughts on these or any other tradeoffs, or some recommended configurations?

Thanks!

-Mike

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Michael Sherman

Infrastructure Lead – Chameleon

Computer Science, University of Chicago

MCS, Argonne National Lab