2013/8/21 MORITA Kazutaka <morita.kazutaka at gmail.com>: > Can you give us the complete sheep command line options and the qemu > tree you are using? Yesterday I was using the master branch of sheep and qemu 1.6.50 (from git). Both have been downloaded and compiled yesterday morning (~7 utc). Note: qemu was compiled on my laptop (always debian wheezy). Sheep was run like this sheep -n size=20000 /mnt/sheep/dsk01,/mnt/sheep/dsk01/obj,/mnt/sheep/dsk02 Now I'm running QEMU emulator version 1.6.0 (the branch taken from git://github.com/sheepdog/qemu.git) And latest master of sheep Sheep 0.7.0_8_gf9d11c6. I removed the object cache option (I was not using it anyway. cache=directsync) sheep -n /mnt/sheep/dsk01,/mnt/sheep/dsk01/obj,/mnt/sheep/dsk02 > (The output of 'git log -1 --oneline' on your > qemu directory may help us.) git log -1 --oneline 81017d9 sheepdog: check simultaneous create in resend_aioreq Now option '-n' is working fine! I get 45-60 M/s. dd if=/dev/zero of=/mnt/small/c bs=1M count=512 oflag=direct qemu-system-x86_64 -name wheezy_template -enable-kvm -drive file=sheepdog:wheezy_template,if=virtio -drive file=sheepdog:big,if=virtio -drive file=sheepdog:small,if=virtio -m 512 -smp 2 |