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:
# virsh domblklist rhel6 Target Source ------------------------------------------------ vda /VirtualMachines/rhel6.img hdc - # virsh domblkstat --human rhel6 vda Device: vda number of read operations: 174670 number of bytes read: 3219440128 number of write operations: 23897 number of bytes written: 164849664 number of flush operations: 11577 total duration of reads (ns): 1005410244506 total duration of writes (ns): 1085306686457 total duration of flushes (ns): 340645193294
