On Saturday, February 12, 2011 12:09:34 pm M. Fioretti wrote:
> On Sat, Feb 12, 2011 19:03:56 PM +0100, Marco Fioretti
(mfioretti@xxxxxxxxxxx) wrote:
> > On Sat, Feb 12, 2011 12:55:16 PM -0500, Lamar Owen (lowen@xxxxxxxx) wrote:
> > > On Saturday, February 12, 2011 12:19:33 pm M. Fioretti wrote:
> > > > besides hard drive and DVD burner there are only Logitech webcam,
> > > > wheelmouse and earphone microphone, but everything is plugged in
> > > > the back which is not really accessible without moving
> > > > furniture. I'll do that if needed, but isn't a way to check for
> > > > those interrupts from the prompt?
> > >
> > > Let's see if iowaits are you issue. Install the sysstat package
> > > (yum install sysstat) and run: iostat -x 1
> >
> > here it is, thanks for the tip. When it isn't zero, the await column
> > gives anything from 27.36 to 35.78 (last line) to 5 (I have already
> > posted top output in a comment to the web page):
> >
> > [root@polaris ~]# iostat -x 1 | egrep -i 'device|sda'
>
> Sorry, of course that's only the part of the story about sda. here is one
> complete run of iostat:
>
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util sda 0.00 5.00 0.00
> 5.00 0.00 64.00 12.80 0.03 6.00 6.00 3.00 dm-0
> 0.00 0.00 0.00 8.00 0.00 64.00 8.00 0.04
> 4.38 3.75 3.00 dm-1 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>
> other runs show all null values for dm-0 / dm-1, or values similar to
> these
>
> Marco
Could you show the output of iostat -x 1,
not iostat -x 1 | egrep -i 'device|sda'
please?
On my system, when I do
iostat -x 1
I get "avg-cpu" besides drive information.
avg-cpu: %user %nice %system %iowait %steal %idle
5.05 0.00 4.04 0.00 0.00 90.91
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
It might help to see the "avg-cpu".
If we are lucky, either the %user or %system or ... will show high cpu usage.
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