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When creating a volume from an image, openstack always uses root disk space?

I have set up cinder to use my SAN storage. When I manually create the volume using the following syntax:

cinder create --display_name testvolume1 40

The volume is created on the SAN exactly where I would expect it to be. However, when I try to create the volume from an image (to create a bootable volume), using the following syntax:

cinder create --image-id <image id=""> --display-name <display name=""> <size>

it runs my root volume out of disk space trying to create the volume, then errors out.

Is this a defect? I have checked every configuration file and do not see where it might be linked to a root directory.