lkml.org 
[lkml]   [2005]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Eradic disk access during reads
Date
Willy Tarreau wrote:
> On Sat, Sep 17, 2005 at 07:26:11AM +0300, Al Boldi wrote:
> > Monitoring disk access using gkrellm, I noticed that a command like
> >
> > cat /dev/hda > /dev/null
> >
> > shows eradic disk reads ranging from 0 to 80MB/s on an otherwise idle
> > system.
> >
> > 1. Is this a hardware or software problem?
>
> Difficult to tell without more info. Can be a broken IDE disk or defective
> ribbon.

Tried the same with 2.4.31 which shows steady behaviour with occasional dips
and pops in the msec range.

>
> > 2. Is there a lightweight perf-mon tool (cmd-line) that would log this
> > behaviour graphically?
>
> You can do " readspeed </dev/hda | tr '\r' '\n' > log " with the readspeed
> tool from there :
> http://w.ods.org/tools/readspeed

Does it have msec resolution?

Thanks!

--
Al
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-09-17 12:41    [W:0.089 / U:0.264 seconds]
©2003-2014 Jasper Spaans. Advertise on this site