红帽全球峰会14.5.5. 显示设备块统计信息
此命令将显示正在运行的域的块统计信息。您需要具有域名和设备名称（使用 virsh domblklist 列出设备）。在这种情况下，块设备是唯一目标名称(<target dev='name'/>)或源文件(< source file ='name'/>)。请注意，并非每个虚拟机监控程序都可以显示每个字段。要确保输出在最方便的表单中显示，请使用
--human 选项，如下所示：
# 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
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