High IO Wait - PowerEdge 2650 - Perc 3/Di

Ray Van Dolson rvandolson at esri.com
Fri Jan 19 11:07:35 CST 2007

On Fri, Jan 19, 2007 at 09:18:35AM -0500, Tillotson, Jeff wrote:
> The system is hanging during or after file writes.  If I do something
> like:
> dd if=/dev/zero of=/home/jefft/file1 bs=512 count=864000 the system will
> eventually hang and come back.  Using sar, iostat, top, I can watch
> iowait
> percentage climb and climb until it hangs.  Then, when I can gain access
> again, it drops slowly.  The iowait percentage goes up even after the dd
> has completed.

Jeff, another question.  Is this reproduceable every time?  I just tried it on
one of our 2650's that had had BIOS updates done, and while I saw some spikes
in iowait activity, the system remained useable and the file finished writing
without any issue.


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