<blkiotune>
  <weight>100</weight>
  <device>
    <path>/dev/sdf</path>
    <weight>200</weight>
    <read_bytes_sec>10000</read_bytes_sec>
    <write_bytes_sec>10000</write_bytes_sec>
    <read_iops_sec>20000</read_iops_sec>
    <write_iops_sec>20000</write_iops_sec>
  </device>
</blkiotune>
