From: Robert Hancock <hancockrwd@gmail.com>
To: Sandra Escandor <sescandor@evertz.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: Western Digital Scorpio and ICH10R on Debian - NCQ issue?
Date: Fri, 15 Jul 2011 19:16:37 -0600 [thread overview]
Message-ID: <4E20E675.2010707@gmail.com> (raw)
In-Reply-To: <C70A636B101FD44999B82525C3E92AFAD8CE5C@otis.burlington.evertz.tv>
On 07/12/2011 10:21 AM, Sandra Escandor wrote:
> The Situation:
> It appears that a WRITE FPDMA QUEUED failed command causes driver
> timeouts - this in turn locks up the RAID (which once worked pretty
> well). This occurred during high I/O.
>
> The question:
> 1. Is it a good idea to turn off NCQ? I've read in different posts that
> it helps some, but not others - I'm currently on the way to getting an
> experimental box setup, but I wanted to confirm if this was a good idea.
Not really a solution to anything, at least not likely in this case.
More of a workaround that might happen to work by chance.
> 2. Are there known issues with the ICH10R + WD7500BPKT-00PK4T0 and the
> libata driver?
Nothing known, no.
>
> The System:
> Four WDC WD7500BPKT-00PK4T0 drives (Western Digital Scorpio) - in RAID10
> array created using mdadm 3.1.4
> ICH10R sata controller.
> Kernel 2.6.32-5-amd64
The fact that you have multiple drives and the problem tends to occur
during heavy I/O may point to a power issue. This has been known to
happen when some of the drives aren't getting enough power when there
are spikes in power draw during I/O access. In this case, using a
beefier power supply or spreading the drives out across different cables
from the PSU may help.
next prev parent reply other threads:[~2011-07-16 1:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-12 16:21 Western Digital Scorpio and ICH10R on Debian - NCQ issue? Sandra Escandor
2011-07-16 1:16 ` Robert Hancock [this message]
2011-07-18 12:42 ` Sandra Escandor
2011-07-18 16:41 ` Robert Hancock
2011-07-19 13:20 ` Sandra Escandor
2011-07-19 14:46 ` Robert Hancock
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