[openstack-dev] [Nova] Raw vs Qcow2 images_type in nova/libvirt

Michael Still mikal at stillhq.com
Mon Jan 19 20:41:47 UTC 2015


qcow2 can do a copy on write layer, although it can be disabled IIRC.
So if COW is turned on, you get only the delta in the instance
directory when using qcow2.


On Tue, Jan 20, 2015 at 7:40 AM, Dmitry Guryanov
<dguryanov at parallels.com> wrote:
> Hello,
> Do I understand correctly, that both Qcow2 and Raw classes in
> libvirt/imagebackend.py can work with images in qcow2 format, but Raw copies
> the whole base image from cache to the instance's dir and Qcow2 only creates
> a delta (and use base image from cache)?
> --
> Dmitry Guryanov
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