linux-kernel - Re: Slow disks.

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Message-ID: <20101222224601.GF30941@bitwizard.nl>
Date:	Wed, 22 Dec 2010 23:46:01 +0100
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	David Rees <drees76@...il.com>
Cc:	Rogier Wolff <R.E.Wolff@...wizard.nl>, linux-kernel@...r.kernel.org
Subject: Re: Slow disks.

On Wed, Dec 22, 2010 at 12:52:08PM -0800, David Rees wrote:
> On Mon, Dec 20, 2010 at 6:15 AM, Rogier Wolff <R.E.Wolff@...wizard.nl> wrote:
> > A friend of mine has a server in a datacenter somewhere. His machine
> > is not working properly: most of his disks take 10-100 times longer
> > to process each IO request than normal.
> 
> I've seen noticeable slowdowns before when the disks were running long
> SMART tests.  It doesn't seem to affect all drives the same.  The
> smartctl data you posted didn't say whether or not the disks were
> currently running a SMART test, but it's worth double checking.

No, the machine has trouble 24/7, I seriously doubt that it would be
running smart tests 24/7. 

	Roger. 

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