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Oracle Linux: %Util from iostat command output can be misleading (Doc ID 2641396.1)

Last updated on MARCH 12, 2020

Applies to:

Linux OS - Version Oracle Linux 5.2 to Oracle Linux 8.0 [Release OL5U2 to OL8]
Linux x86
Linux x86-64

Symptoms

Based on below iostat output command:

zzz ***Mon Dec 16 10:27:18 CST 2019

avg-cpu: %user %nice %system %iowait %steal %idle

4.14 0.00 2.87 11.45 0.00 81.54

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util

sda 0.00 0.00 286.00 2437.00 2288.00 18676.00 15.40 10.72 0.21 1.39 0.07 0.33 90.50

 

zzz ***Mon Dec 16 10:27:48 CST 2019

avg-cpu: %user %nice %system %iowait %steal %idle

0.22 0.00 0.09 15.56 0.00 84.12

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util

sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11.00 0.00 0.00 0.00 0.00 100.00 <---

 

Why sda drive still show 100% util where there is no incoming read or write operation.

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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