Date: Sat, 1 Mar 2008 16:53:52 -0800 From: Jeremy Chadwick <koitsu@freebsd.org> To: Scott Long <scottl@samsco.org> Cc: freebsd-stable@freebsd.org, Stephen Hurd <shurd@sasktel.net> Subject: Re: ad0 READ_DMA TIMEOUT errors on install of 7.0-RELEASE Message-ID: <20080302005352.GA72081@eos.sc1.parodius.com> In-Reply-To: <47C5C622.5000209@samsco.org> References: <47C52948.2070500@sasktel.net> <20080227121129.GA76419@eos.sc1.parodius.com> <47C5ACD0.8000009@sasktel.net> <47C5C622.5000209@samsco.org>
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On Wed, Feb 27, 2008 at 01:20:50PM -0700, Scott Long wrote: > I'd like to attack these driver problems. What I need is to spend a > couple of days with an affected system that can reliably reproduce the > problem, instrumenting and testing the driver. I have a number of > theories about what might be going wrong, but nothing that I'm > definitely sure about. If you are willing to set up your system with > remote power and remote serial, and if we knew a reliable way to > reproduce the problem, I could probably have the problem identified and > fixed pretty quickly. Scott, I just wanted to take a moment to publicly thank you for stepping up to the plate on this one. I have a feeling that most of these reports will have to be dealt with on a case-by-case basis, but despite that, I really do apprecaite you offering to take this one. Thank you very, very much. In regards to my experience with said problem, I haven't been able to reproduce the errors I saw on January 25th: http://lists.freebsd.org/pipermail/freebsd-stable/2008-January/040013.html I do need to get the box in question into our datacenter and set up our remaining dev/test box to do nothing but hard I/O between ZFS and UFS for hours (or days) on end to see if I can reproduce it. There's an entry in the FreeBSD ZFS wiki about this problem, but there's a possibility the issue I saw is different than what another user reported (his result was a panic, my result was a machine that locked up hard after letting FreeBSD report DMA errors for some time). That user's post is here: http://lists.freebsd.org/pipermail/freebsd-stable/2008-January/040047.html -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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