Not exactly, although you can do something similar in both folsom and grizzly. 
If you have a volume snapshot you can pass it in the block_device_mapping when 
you boot an instance and nova will automatically create a volume from the 
snapshot and boot from it. If you also set delete_on_terminate true you have 
roughly the same experience as an EBS backed instance.

nova boot --block-device-mapping vda=<snap-id>:snap:<size>:True


You cannot currently pass an image id and get a volume backed instance. It 
requires two steps

cinder create --image-id=<image-id>
nova boot --block-device-mapping vda=<vol-id>

Vish



On Mar 11, 2013, at 6:24 AM, Logan McNaughton <lo...@bacoosta.com> wrote:

> Will Grizzly support specifying an empty Cinder volume as an instance's root 
> device?
> 
> Right now you need to setup the volume before hand and you can "boot from 
> volume". But will there be support similar to AWS EBS-backed instances in 
> Grizzly?
> 
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