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Date: Wed, 1 Nov 2006 01:16:13 -0700
From: "Richard Fish" <bigfish@asmallpond.org>
Sender: richard.j.fish@gmail.com
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] dma_intr errors on heavy writes -- cause for concern?
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On 10/31/06, Richard Broersma Jr <rabroersma@yahoo.com> wrote:
> > So my guess is that your filesystem is getting confused under load,
> > and trying to access stuff that is beyond the end of your raid array.
> > So, which fs and kernel version?
>
> oops, I was mistake, I forgot that when I re-arrange my disks my RAID10 is partly using hda/hdc.
>
> Linux version 2.6.17-gentoo-r7 (root@db_server01)
> (gcc version 4.1.1 (Gentoo 4.1.1)) #8 Sun Oct 8 20:28:34 PDT 2006
>
> md4 : active raid10 hdg1[3] hde1[2] hdc1[1] hda1[0]
> 586098688 blocks 1024K chunks 2 near-copies [4/4] [UUUU]
Ok well this sort of changes things for me. I would start to suspect
hardware...particularly any hardware that is specific to hda/hdc, and
particularly the cables (since you mentioned "re-arranging" things).
Remember that UDMA cables are really sensitive to length (really must
be less than 18 inches long), and damage.
One thing you could try is move the disks around. Linux software raid
is pretty tolerant to those kinds of changes, so it should be safe to
exchange hdc and hdg, for example. If the problem follows the hda
drive to hdg, then you know you have a drive about to fail. If it now
happens with a different drive on hda, then cable, motherboard, or RAM
issues have to be suspected.
-Richard
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