1. In the background of the host where the VM resides, run the following command to find the device name of the VM disk on the host.
virsh domblklist <vm_id>
Echo description:
Target: The corresponding drive letter of the disk inside the virtual machine.
Source: The device name of the disk on the host. Its naming format is:
System disk: /dev/mapper/<vm id>-root
User disk: /dev/mapper/<volume uuid>-user
2. Run the lsblk command to check the corresponding drive letter of the VM device on the host and the device relationship it depends on.
Echo description:
The system disk of the virtual machine i-0000022C corresponds to the device on the host, which is dm-6, and is subordinate to sda.
The device corresponding to the host disk of the user disk is dm-7, which is subordinate to sda.
3. Use the command to view the IO status of the virtual machine disk on the host.
iostat -kx 1 <device>
