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Date:      Thu, 12 Jul 2007 00:10:52 +0100
From:      Feargal Reilly <feargal@fbi.ie>
To:        NetOpsCenter <noc@hdk5.net>
Cc:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: Complete hang during boot at boot2 prompt
Message-ID:  <20070712001052.6fd1c78b@mablung.edhellond.fbi.ie>
In-Reply-To: <4695148A.9010200@hdk5.net>
References:  <20070711182300.4634e278@mablung.edhellond.fbi.ie> <4695148A.9010200@hdk5.net>

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On Wed, 11 Jul 2007 07:34:02 -1000
NetOpsCenter <noc@hdk5.net> wrote:

> Feargal Reilly wrote:
> 
> >Hi,
> >
> >There, I yanked a memory module, and it booted fine, albeit
> >complaining about the degraded RAID array. However, when I
> >reinserted the memory, it continued to boot. I didn't have the
> >foresight to try it before I fiddled with the disks, but I
> >can't imagine that it had been seated incorrectly as the
> >server had been up for two months without problem. Also, the
> >BIOS tests passed, although I know they aren't too in depth.
> >I'll run sysutils/memtest anyway, and see what that throws up.
> >
> >Any other suggestions as to what caused the failure? I know
> >I've changed the conditions and may never be able to
> >reproduce it (nor do I want to), but if I've failing
> >hardware, I'd like a best guess as to where it is.
> >
>
> I have had memory chips walk out of the slots on several
> occasions. Sometimes its vibration or in Hawaii we have
> humidity issues occasionally that tend to cause this too.
> I have learned to spray the sockets and card connections with
> contact cleaner about every 6 months to avaid this problem.
> Especially in areas where servers are not in a cool
> environment.
> 

It was operating in a climate controlled server room, so in
theory the sub-optimal, being stacked with three other servers,
all without rails, so I guess vibration is one plausible
explanation.

-fr.

-- 
Feargal Reilly, Chief Techie, FBI.
PGP Key: 0xBD252C01 (expires: 2006-11-30)
Web: http://www.fbi.ie/ | Tel: +353.14988588 | Fax: +353.14988489
Communications House, 11 Sallymount Avenue, Ranelagh, Dublin 6.



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