Comment 0 for bug 1889729

When Ceph RBD backend is enabled for Glance and Nova, there will be a noticeable difference in time and resource consumption when launching instances from Glance images in RAW and non-RAW formats.

At the moment the official ubuntu cloud images are available in QCOW2 format, so a conversion to raw is necessary in prior to uploading the images.
Therefore, I think an option to convert the QCOW2 to Raw is beneficial to have in order to leverage the copy-on-write feature in Ceph.