Date: Thu, 25 Sep 2003 00:43:01 -0700
From: Andrew Morton <akpm@osdl.org>
To: Aaron Lehmann <aaronl@vitelus.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Complete I/O starvation with 3ware raid on 2.6
Message-Id: <20030925004301.171f6645.akpm@osdl.org>
In-Reply-To: <20030925071252.GE22525@vitelus.com>
References: <20030925071252.GE22525@vitelus.com>
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Aaron Lehmann <aaronl@vitelus.com> wrote:
>
> I'm running bkcvs HEAD on a newly installed system, and started
> copying files over to my RAID 5 from older IDE disks. When I copy
> these files, the system becomes unusable. Specifically, any disk
> access on the 3ware array, no matter how simple, even starting 'vi' on
> a file, takes minutes or eternity to complete. Suspending the process
> doing the copying doesn't even help much, because the LEDs on the card
> continue blinking for about 30 seconds after the suspension. This
> happens whether the IDE drive is using DMA or not. It seems that some
> kind of insane queueing is going on. Are there parameters worth
> playing with? Should I try the deadline I/O scheduler?

An update to the 3ware driver was merged yesterday.  Have you used earlier
2.5 kernels?

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