It has to be said it would be really convenient to have a 'zero' and/or 'trim' method of some sort.
qemu-img tries hard to trim the whole disk before using it. Unfortunately it does this in different ways across RHEL 7 and upstream. With upstream I managed a workaround based on ignoring any zero requests which arrive before the first write. However it's not so easy to do this for RHEL 7's qemu which is issuing mixed writes and zeroes in different orders. How hard would it be to implement a special https request in imageio for zeroing (better still, either zeroing or trimming) a range of bytes? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://www.redhat.com/mailman/listinfo/libguestfs