it seems that when TMP is full (i use tmpfs) virt-sparsify doesnt exist with an error but it freezes my last test is this: Fill free space in /dev/vg_centos63/lv_root with zero ... libguestfs: send_to_daemon: 52 bytes: 00 00 00 30 | 20 00 f5 f5 | 00 00 00 04 | 00 00 01 37 | 00 00 00 00 | ... guestfsd: main_loop: new request, len 0x30 random filename: /sysroot//3x23hphk.zhd ◑ 8% ⟦▓▓▓▓▓▓▓▓▓▓══════════════════════════════════════════════════════════════════════════════════════════════════════════════════⟧ 01:49 -- Evaggelos Balaskas - Unix System Engineer http://gr.linkedin.com/in/evaggelosbalaskas