iowait 2006-01-11 - By Marc Wiatrowski
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> -- --Original Message-- --
> From: Arjan van de Ven
> Sent: Wednesday, January 11, 2006 2:50 PM
> Subject: Re: iowait
>
> On Wed, 2006-01-11 at 14:34 -0500, Hoover Mark A AISC CONT wrote:
> > I've got an annoying little problem that I'm trying to find the answer to.
> >
> > I have something that about every 2-3 days I have something that runs I/O
> > wait up to anywhere between 4-10%. Normally ours is 0-1%. This isn't
> > bringing the server to its knees, but I'd really like to find out what
> > process is doing it.
> >
> > If anybody can tell me how to match a given process to the iowait, I'd
> > really appreciate it. I've been looking at the output of iostat, vmstat,
> > lsof, ps, and top all morning and don't feel any closer than when I started.
>
> look for "D" state processes in ps / top.
>
> note that iowait is idle time (even when it's not accounted
> in the idle
> percentage), the cpu is doing nothing, just something is waiting for
> disk.
>
Which could also be network related if the disk is not local.
my 2 cents,
marc
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