iowait is the percentage of time that the CPU was idle during which the system had an outstanding disk I/O request.

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15.10 high i/o wait problem

Alright, so I'm having an issue with getting high i/o wait with even mundane tasks. Switching a tab in a browser? Yup. Moving a file using the GUI? Yup. Opening the menu in Firefox? Yup. Basically, it'...
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166 views

High iowait on Ubuntu 16.04 - with encrypted disk

I've been using ubuntu 14.04 for a few years now and all worked great. A few days ago I installed 16.04 and encrypted my disk *something I haven't done before). Now 2-3 times a day the iowait goes 100%...
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29 views

Pc crashes due to very high iowait.

I currently have Ubuntu 15.10 installed on my pc. It is frequently crashing after showing high iowait. I have recently changed my hard drive with a new one after my older one died. Please suggest ways ...
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74 views

Compiz high (>90%) IOWait when idle

I noticed strange high IOWait for very long time on System Load Indicator (Ubuntu 15.04). This happens sometimes when I login again to ubuntu (from lockscreen) and immediately after that the IOWait ...
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287 views

Ubuntu 14.04.1 hangs every minute

Every minute I get a second or so of minor lag. So far I know the following: It happens every minute around :00 seconds It only affects video, not audio I get a spike of iowait and disk write every ...
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3k views

Very high IOWAIT times

I have a large system - 128GB, a couple of RAID0 filesystems (6TB and 2TB) with an SSD cache, 8 cores (16 with hyperthreading), running Ubuntu 12.04 64bit. When I try to write a large file I get very ...
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2k views

very high IOWait + extremely slow hdparm -tT

I have been running 12.04 on my Fujitsu Siemens Lifebook E751 for almost a year without any problems, and then several days ago I noticed a very high CPU IOwait that makes the system poorly responsive ...
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2k views

Machine stops suddenly, Only hard reset can help

It is happens sometimes, im just working and suddenly machine starts lagging. Then it can totaly stops (Nothing works, mouse, keyboard etc.), or sometimes not. Jun 5 16:04:12 c0rp kernel: [ 2636....