linux-kernel - Re: Lots of con-current I/O = resets SATA link? (2.6.25.10)

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Date:	Tue, 8 Jul 2008 08:24:07 +0200 (CEST)
From:	Gerhard Wiesinger <lists@...singer.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: Lots of con-current I/O = resets SATA link? (2.6.25.10)

On Mon, 7 Jul 2008, Justin Piszcz wrote:

> Hi Gerhard,
>
> It /could/ be the port itself if you have changed the cable and disk..
>

Yes, but it is very unlikely. I have written TB of data there without any 
problems. Anyway this is my 3rd exchanged SAMSUNG disk ...


> Have you tried loading the disk with dd and seeing if you can reproduce the 
> problem? You are getting the same error I get generally, I can recommend 
> turning OFF NCQ first and see if the problem goes away.
>
> # Define DISKS.
> cd /sys/block
> DISKS=$(/bin/ls -1d sd[a-z])
>
> # Disable NCQ on all disks.
> echo "Disabling NCQ on all disks..."
> for i in $DISKS
> do
>  echo "Disabling NCQ on $i"
>  echo 1 > /sys/block/"$i"/device/queue_depth
> done
>

I tried to disable NCQ on all disks and tried to rebuild the raid, but it 
still failed to rebuild with the same error message.

I also tried the nolapic kernel parameter without success.

/dev/sda:  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
/dev/sdb:  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
/dev/sdc:  5 Reallocated_Sector_Ct   0x0033   091   091   010    Pre-fail  Always       -       413
/dev/sdd:  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
/dev/sde:  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
/dev/sdf:  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0

The only thing is that the Reallocated_Sector_Ct is still >0 on /dev/sdc 
(keep in mind this is my 3rd new Samsung disk on /dev/sdc and I had up to 
3000 Reallocated_Sector_Ct on previous disks in < 1 day !!!).

Should I replace the disk a fourth time?

When you search in google you find a lot of threads with the timeout 
problem. Might this be a software issue?

Any ideas?

Thnx.

Ciao,
Gerhard

--
http://www.wiesinger.com/
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