On Mon, Sep 05, 2011 at 10:01:33AM +0100, Richard W.M. Jones wrote: As well as trying the above steps, you could also try this command (if it fails, try also adding the -v option): $ guestfish -N lvfs zerofree /dev/VG/LV -x libguestfs: trace: set_pgroup true libguestfs: trace: set_pgroup = 0 libguestfs: trace: add_drive "test1.img" libguestfs: trace: add_drive = 0 libguestfs: trace: is_config libguestfs: trace: is_config = 1 libguestfs: trace: launch libguestfs: trace: launch = 0 libguestfs: trace: part_disk "/dev/sda" "mbr" libguestfs: trace: part_disk = 0 libguestfs: trace: pvcreate "/dev/sda1" libguestfs: trace: pvcreate = 0 libguestfs: trace: vgcreate "VG" "/dev/sda1" libguestfs: trace: vgcreate = 0 libguestfs: trace: lvcreate "LV" "VG" 1 libguestfs: trace: lvcreate = 0 libguestfs: trace: lvresize_free "/dev/VG/LV" 100 libguestfs: trace: lvresize_free = 0 libguestfs: trace: mkfs "ext2" "/dev/VG/LV" libguestfs: trace: mkfs = 0 libguestfs: trace: zerofree "/dev/VG/LV" libguestfs: trace: zerofree = 0 libguestfs: trace: close libguestfs: trace: internal_autosync libguestfs: trace: internal_autosync = 0 libguestfs: trace: kill_subprocess libguestfs: trace: kill_subprocess = 0 $ guestfish version major: 1 minor: 13 release: 11 extra: -1.fc17 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top