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14.5.5. Displaying Device Block Statistics
This command will display the block statistics for a running domain. You need to have both the domain name and the device name (use the
virsh domblklist to list the devices.)In this case a block device is the unique target name (<target dev='name'/>) or a source file (< source file ='name'/>). Note that not every hypervisor can display every field. To make sure that the output is presented in its most legible form use the --human option, as shown: