From e653d3ffac1267694c03cba427e439f4cbc57836 Mon Sep 17 00:00:00 2001
From: BingCoke <81607010+BingCoke@users.noreply.github.com>
Date: Mon, 22 May 2023 18:15:24 +0800
Subject: [PATCH] doc: Update iostat.md (#498)
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iostat的util参数解读有误。参照于man手册
Percentage of elapsed time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100% for  devices  serving  requests  serially.But  for  devices serving requests in parallel, such as RAID arrays and modern SSDs, this number does not reflect their performance limits.
---
 command/iostat.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/command/iostat.md b/command/iostat.md
index 12de5a3b6c..0bf3d25e00 100644
--- a/command/iostat.md
+++ b/command/iostat.md
@@ -69,6 +69,6 @@ avgrq-sz | 需求的平均大小区段
 avgqu-sz | 需求的平均队列长度
 await | 等待I/O平均的时间（milliseconds）
 svctm | I/O需求完成的平均时间
-%util | 被I/O需求消耗的CPU百分比
+%util | 设备带宽的使用率，达到100%表示饱和，达到性能瓶颈，如果是支持处理并发请求的设备则不代表性能瓶颈。