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Using virtio-blk for VM Storage

virtio-blk virtual drives provide higher storage performance than virtio-scsi virtual drives. If VM services do not depend on virtio-scsi drives and have high performance requirements, you are advised to use virtio-blk virtual drives.

Add configuration in an XML file to use virtio-blk for the VM. The following is an example:
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<domain type = 'KVM'>
...
    <disk type='file'  device='disk'/>
      <driver name='qemu'  type='qcow2' />
      <source file='home/kvm/images/node1.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </disk>
...
</domain>