I've used script
#!/bin/bash
while (true) do
str=`date`" $(cat /sys/block/sda/stat)"
echo $str >> log.txt
sleep 1;
done
Reproduced in:
Linux vm145 4.10.0-35-generic #39~16.04.1-Ubuntu SMP Wed Sep 13 09:02:42 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenia
The difference of numbers of sectors written between line 30 and 29 in
log.txt is very big and in gigabytes equal 153Gb/sec
(876330784-554468984)*512/(1024*1024*1024)
** Attachment added: "log.txt"
https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1713029/+attachment/4956575/+files/log.txt
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https://bugs.launchpad.net/bugs/1713029
Title:
Statistics of IO using is incorrect
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