blkdeviotune-max-length.xml

<domain type='qemu'>
  <name>QEMUGuest1</name>
  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
  <memory unit='KiB'>219100</memory>
  <currentMemory unit='KiB'>219100</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='i686' machine='pc'>hvm</type>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-i686</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source dev='/dev/HostVG/QEMUGuest1'/>
      <target dev='hda' bus='ide'/>
      <iotune>
        <total_bytes_sec>5000</total_bytes_sec>
        <total_iops_sec>6000</total_iops_sec>
        <total_bytes_sec_max>10000</total_bytes_sec_max>
        <total_iops_sec_max>11000</total_iops_sec_max>
        <total_bytes_sec_max_length>3</total_bytes_sec_max_length>
        <total_iops_sec_max_length>5</total_iops_sec_max_length>
      </iotune>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source dev='/dev/HostVG/QEMUGuest2'/>
      <target dev='hdb' bus='ide'/>
      <iotune>
        <read_bytes_sec>5000</read_bytes_sec>
        <write_bytes_sec>5500</write_bytes_sec>
        <read_iops_sec>3500</read_iops_sec>
        <write_iops_sec>4000</write_iops_sec>
        <read_bytes_sec_max>6000</read_bytes_sec_max>
        <write_bytes_sec_max>6500</write_bytes_sec_max>
        <read_iops_sec_max>7000</read_iops_sec_max>
        <write_iops_sec_max>7500</write_iops_sec_max>
        <size_iops_sec>2000</size_iops_sec>
        <read_bytes_sec_max_length>3</read_bytes_sec_max_length>
        <write_bytes_sec_max_length>5</write_bytes_sec_max_length>
        <read_iops_sec_max_length>7</read_iops_sec_max_length>
        <write_iops_sec_max_length>9</write_iops_sec_max_length>
      </iotune>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </memballoon>
  </devices>
</domain>