On 01/18/2013 11:43 PM, Liu Yuan wrote: > # start up the guest > $ qemu-system-x86_64 --enable-kvm -drive > file=~/images/test1,if=virtio,cache=writeback -smp 2 -cpu host -m 1024 > -drive file=sheepdog:test,if=virtio,cache=writeback > # write to the /dev/vdb of the guest > # sudo dd if=/dev/urandom of=/dev/vdb bs=4M count=1 oflag=direct,sync > > This doesn't trigger flush for vdb device. I also write a small program > to call fsync(2) to the device, no flush neither. > > Only the poweroff of the guest will trigger the flush request for vdb. > So is this expected behavior and I am missing something?
Oops, it is something wrong in the Guest. I created a new guest and it works like a charm. Sorry for the false alarm. Thanks, Yuan
