Hi, 4:23 AM and this paradox is struggling my head... Can someone please confirm if oVirt supports QCOW2 *base* images? AFAIK, oVirt only supports QCOW2 for *snapshots* not base images. Base images must always be in RAW format and there is no way to create QCOW2 disks in Engine [1]. On the other hand, working with RAW images on a GlusterFS storage is inefficient because of [2]. in fact, sparse-files performance is unacceptable [3]. Please confirm, comment or ignore. [1] : https://bugzilla.redhat.com/show_bug.cgi?id=1282654 [2] : https://bugzilla.redhat.com/show_bug.cgi?id=1220173 [3] : For example.: A empty RAW disk image file with 2 TB virtual-size and less then 1 MB physical-size is treated by Gluster as a 2 TB physical-size file (TB's of useless zeros traversing the DataCenter's LAN during many hours).