From: maarten <maarten@ultratux.net>
To: linux-raid@vger.kernel.org
Subject: Re: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard)
Date: Tue, 4 Jan 2005 22:05:13 +0100 [thread overview]
Message-ID: <200501042205.13061.maarten@ultratux.net> (raw)
In-Reply-To: <Pine.LNX.4.44.0501042052430.3584-100000@uplift.swm.pp.se>
On Tuesday 04 January 2005 20:57, Mikael Abrahamsson wrote:
> On Tue, 4 Jan 2005, Maarten wrote:
> > failures within the first 10 years, let alone 20, to even remotely
> > support that outrageous MTBF claim.
>
> One should note that environment seriously affects MTBF, even on
> non-movable parts, and probably even more on movable parts.
Yes. Heat especially above all else.
> I've talked to people in the reliability business, and they use models
> that say that MTBF for a part at 20 C as opposed to 40 C can differ by a
> factor of 3 or 4, or even more. A lot of people skimp on cooling and then
> get upset when their drives fail.
>
> I'd venture to guess that a drive that has an MTBF of 1.2M at 25C will
> have less than 1/10th of that at 55-60C.
Yes. I know that full well. Therefore my server drives are mounted directly
behind two monstrous 12cm fans... I don't take no risks. :-)
Still, two western digitals have died within the first or second year in that
enclosure. So much for MTBF vs. real world expectancy I guess.
It should be public knowledge by now that heat is the number 1 killer for
harddisks. However, you still see PC cases everywhere where disks are
sandwiched together and with no possible airflow at all. Go figure...
Maarten
--
next prev parent reply other threads:[~2005-01-04 21:05 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200501030916.j039Gqe23568@inv.it.uc3m.es>
2005-01-03 10:17 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Guy
2005-01-03 11:31 ` Peter T. Breuer
2005-01-03 17:34 ` Guy
2005-01-03 19:20 ` ext3 Gordon Henderson
2005-01-03 19:47 ` ext3 Morten Sylvest Olsen
2005-01-03 20:05 ` ext3 Gordon Henderson
2005-01-03 17:46 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) maarten
2005-01-03 19:52 ` maarten
2005-01-03 20:41 ` Peter T. Breuer
2005-01-03 23:19 ` Peter T. Breuer
2005-01-03 23:46 ` Neil Brown
2005-01-04 0:28 ` Peter T. Breuer
2005-01-04 1:18 ` Alvin Oga
2005-01-04 4:29 ` Neil Brown
2005-01-04 8:43 ` Peter T. Breuer
2005-01-04 2:07 ` Neil Brown
2005-01-04 2:16 ` Ewan Grantham
2005-01-04 2:22 ` Neil Brown
2005-01-04 2:41 ` Andy Smith
2005-01-04 3:42 ` Neil Brown
2005-01-04 9:50 ` Peter T. Breuer
2005-01-04 14:15 ` David Greaves
2005-01-04 15:20 ` Peter T. Breuer
2005-01-04 16:42 ` Guy
2005-01-04 17:46 ` Peter T. Breuer
2005-01-04 9:30 ` Maarten
2005-01-04 10:18 ` Peter T. Breuer
2005-01-04 13:36 ` Maarten
2005-01-04 14:13 ` Peter T. Breuer
2005-01-04 19:22 ` maarten
2005-01-04 20:05 ` Peter T. Breuer
2005-01-04 21:38 ` Guy
2005-01-04 23:53 ` Peter T. Breuer
2005-01-05 0:58 ` Mikael Abrahamsson
2005-01-04 21:48 ` maarten
2005-01-04 23:14 ` Peter T. Breuer
2005-01-05 1:53 ` maarten
2005-01-04 9:46 ` Peter T. Breuer
2005-01-04 19:02 ` maarten
2005-01-04 19:12 ` David Greaves
2005-01-04 21:08 ` Peter T. Breuer
2005-01-04 22:02 ` Brad Campbell
2005-01-04 23:20 ` Peter T. Breuer
2005-01-05 5:44 ` Brad Campbell
2005-01-05 9:00 ` Peter T. Breuer
2005-01-05 9:14 ` Brad Campbell
2005-01-05 9:28 ` Peter T. Breuer
2005-01-05 9:43 ` Brad Campbell
2005-01-05 15:09 ` Guy
2005-01-05 15:52 ` maarten
2005-01-05 10:04 ` Andy Smith
2005-01-04 22:21 ` Neil Brown
2005-01-05 0:08 ` Peter T. Breuer
2005-01-04 22:29 ` Neil Brown
2005-01-05 0:19 ` Peter T. Breuer
2005-01-05 1:19 ` Jure Pe_ar
2005-01-05 2:29 ` Peter T. Breuer
2005-01-05 0:38 ` maarten
2005-01-04 9:40 ` Peter T. Breuer
2005-01-04 11:57 ` Which drive gets read in case of inconsistency? [was: ext3 journal on software raid etc] Michael Tokarev
2005-01-04 12:40 ` Morten Sylvest Olsen
2005-01-04 12:44 ` Peter T. Breuer
2005-01-04 14:22 ` Maarten
2005-01-04 14:56 ` Peter T. Breuer
2005-01-04 14:03 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) David Greaves
2005-01-04 14:07 ` Peter T. Breuer
2005-01-04 14:43 ` David Greaves
2005-01-04 15:12 ` Peter T. Breuer
2005-01-04 16:54 ` David Greaves
2005-01-04 17:42 ` Peter T. Breuer
2005-01-04 19:12 ` David Greaves
2005-01-04 0:45 ` maarten
2005-01-04 10:14 ` Peter T. Breuer
2005-01-04 13:24 ` Maarten
2005-01-04 14:05 ` Peter T. Breuer
2005-01-04 15:31 ` Maarten
2005-01-04 16:21 ` Peter T. Breuer
2005-01-04 20:55 ` maarten
2005-01-04 21:11 ` Peter T. Breuer
2005-01-04 21:38 ` Peter T. Breuer
2005-01-04 23:29 ` Guy
2005-01-04 19:57 ` Mikael Abrahamsson
2005-01-04 21:05 ` maarten [this message]
2005-01-04 21:26 ` Alvin Oga
2005-01-04 21:46 ` Guy
2005-01-03 20:22 ` Peter T. Breuer
2005-01-03 23:05 ` Guy
2005-01-04 0:08 ` maarten
2005-01-04 8:57 ` I'm glad I don't live in Spain (was Re: ext3 journal on software raid) David L. Smith-Uchida
2005-01-03 21:36 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Guy
2005-01-04 0:15 ` maarten
2005-01-04 11:21 ` Michael Tokarev
2005-01-03 9:30 Peter T. Breuer
-- strict thread matches above, loose matches on Subject: below --
2004-12-30 0:31 PROBLEM: Kernel 2.6.10 crashing repeatedly and hard Georg C. F. Greve
2004-12-30 16:23 ` Georg C. F. Greve
2004-12-30 17:39 ` Peter T. Breuer
2004-12-30 19:50 ` Michael Tokarev
2004-12-30 21:39 ` Peter T. Breuer
2005-01-02 19:42 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Andy Smith
2005-01-02 20:18 ` Peter T. Breuer
2005-01-03 0:30 ` Andy Smith
2005-01-03 6:41 ` Neil Brown
2005-01-03 8:37 ` Peter T. Breuer
2005-01-03 8:03 ` Peter T. Breuer
2005-01-03 8:58 ` Guy
2005-01-03 12:11 ` Michael Tokarev
2005-01-03 14:23 ` Peter T. Breuer
2005-01-03 18:30 ` maarten
2005-01-03 21:36 ` Michael Tokarev
2005-01-05 9:56 ` Andy Smith
2005-01-05 10:44 ` Alvin Oga
2005-01-05 10:56 ` Brad Campbell
2005-01-05 11:39 ` Alvin Oga
2005-01-05 12:02 ` Brad Campbell
2005-01-05 13:23 ` Alvin Oga
2005-01-05 13:33 ` Brad Campbell
2005-01-05 14:12 ` Erik Mouw
2005-01-05 14:37 ` Michael Tokarev
2005-01-05 17:11 ` Erik Mouw
2005-01-06 5:41 ` Brad Campbell
2005-01-05 15:17 ` Guy
2005-01-05 15:33 ` Alvin Oga
2005-01-05 16:22 ` Michael Tokarev
2005-01-05 17:23 ` Peter T. Breuer
2005-01-05 16:23 ` Andy Smith
2005-01-05 16:30 ` Andy Smith
2005-01-05 17:07 ` Guy
2005-01-05 17:21 ` Alvin Oga
2005-01-05 17:32 ` Guy
2005-01-05 18:37 ` Alvin Oga
2005-01-05 17:26 ` David Greaves
2005-01-05 18:16 ` Peter T. Breuer
2005-01-05 18:28 ` Guy
2005-01-05 18:26 ` Guy
2005-01-05 15:48 ` Peter T. Breuer
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