From: Willy Tarreau <willy@w.ods.org>
To: Al Boldi <a1426z@gawab.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Eradic disk access during reads
Date: Sat, 17 Sep 2005 07:50:10 +0200 [thread overview]
Message-ID: <20050917055010.GG30279@alpha.home.local> (raw)
In-Reply-To: <200509170717.03439.a1426z@gawab.com>
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.
> 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
Then you just have to graph $6 (kB/s) versus $1 (bytes read). There may
be other tools which do all this automatically though.
Regards,
Willy
next prev parent reply other threads:[~2005-09-17 5:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-17 4:26 Al Boldi
2005-09-17 5:50 ` Willy Tarreau [this message]
2005-09-17 10:32 ` Al Boldi
2005-09-17 10:44 ` Denis Vlasenko
2005-09-17 16:38 ` Al Boldi
2005-09-18 11:00 ` Denis Vlasenko
2005-09-18 13:40 ` Al Boldi
2005-09-18 16:02 ` Denis Vlasenko
2005-09-18 16:34 ` Willy Tarreau
2005-09-18 18:08 ` Al Boldi
2005-09-17 18:46 ` Willy Tarreau
2005-09-18 4:16 ` Al Boldi
2005-09-18 5:23 ` Willy Tarreau
2005-09-18 6:54 ` Al Boldi
2005-09-18 10:40 ` Denis Vlasenko
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