On Thu, Mar 3, 2011 at 7:32 PM, Phillip Susi <psusi@cfl.rr.com> wrote: >> And we use some linux specific ioctl to avoid that fragmentation. > > Could you be more specific? sync_file_range(fd.a, 0, 0, SYNC_FILE_RANGE_WRITE); sync_file_range(fd.a, 0, 0, SYNC_FILE_RANGE_WAIT_BEFORE); Olaf