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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Prevent page cache above certain RAM usage level

Someone here on AskUbuntu pointed out that disk caching is harmless thing, that only makes your disc read times faster. And that it is birds singing and flowers only. I kinda have to disagree: I ...
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When I try to copy files between drives the IOWAIT is high

When ever i try to make copy of files the iowait is very high and computer hangs a lot, until the copy process is finish, any help. Ubuntu 14.04.1 HP Elitebook 8440p Core i5 2.4GHz 6gb RAM and 6gb ...
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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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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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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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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: [ ...