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Update iostat.rst #49

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2 changes: 1 addition & 1 deletion tool/iostat.rst
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Expand Up @@ -70,7 +70,7 @@ disk属性值说明：
* avgqu-sz: 平均I/O队列长度。
* await: 平均每次设备I/O操作的等待时间 (毫秒)。
* svctm: 平均每次设备I/O操作的服务时间 (毫秒)。
* %util: 一秒中有百分之多少的时间用于 I/O 操作，即被io消耗的cpu百分比
* %util: 一秒中有百分之多少的时间用于 I/O 操作。

备注：如果 %util 接近 100%，说明产生的I/O请求太多，I/O系统已经满负荷，该磁盘可能存在瓶颈。如果 svctm 比较接近 await，说明 I/O 几乎没有等待时间；如果 await 远大于 svctm，说明I/O 队列太长，io响应太慢，则需要进行必要优化。如果avgqu-sz比较大，也表示有大量io在等待。

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