Hi, If the qemu-img is able to handle RBD in a clever way (and I assume it does) it is able to sparsely write the image to the Ceph pool. But, it is an assumption! Maybe someone else could shed some light on this? Or even better: read the source, the RBD handler specifically. And last but not least, create an empty test image in qcow2 sparse format of e.g. 10G and store it on Ceph. In other words: just test it and you'll know for sure. Cheers, Kees On 13-07-16 09:31, Fran Barrera wrote: > Yes, but is the same problem isn't? The image will be too large > because the format is raw. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com