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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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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SSD causes occasional 100% iowait and freeze. How can i fix this?

My Problem: Sometimes my Computer or just some applications freeze and i can see iowait (with system-monitor-tool) jump to 100% (on some or all cores) for like 15 seconds. This is extremely annoying. ...
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989 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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530 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: [ ...