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Hi guys,

Under current VM provisioning implementation, if a VM's template/base
image does not been cached yet in nova compute host local (in '_base'
folder by default) then nova-compute need download the image to local
firstly, it will be cached as a reusable template/base image. For now,
template/base image preparing can only use downloading method, that is
nova-compute need copy each bits of the image to local from glance
store via API. But the copy is not good for performance so I plan to
give an alternative way for nova-compute prepare template/base image
with more performance - zero-copy.

https://blueprints.launchpad.net/nova/+spec/effective-template-base-image-preparing

Any comments/inputs/thoughts are welcome.

thanks,
Zhi Yan