Libvirt tips

libvirt

# Command line for libvirt
<qemu:commandline>
  <qemu:arg value='-drive'/>
  <qemu:arg value='file=/var/lib/libvirt/centos.img,format=raw,if=none,id=drive-nvme-disk0'/>
  <qemu:arg value='-device'/>
  <qemu:arg value='nvme,id=drive-nvme-disk0,serial=serial0'/>
</qemu:commandline>

# IO tune
<disk type='file' device='disk'>
  <driver name='qemu' type='raw'/>
  <source file='/media/arhiv/vm1.img'/>
  <target dev='vda' bus='virtio'/>
  <iotune>
    <read_iops_sec>120</read_iops_sec>
    <write_iops_sec>90</write_iops_sec>
  </iotune>
</disk>