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Date: Fri, 5 Jul 2002 22:23:40 +0200
From: Matthias Andree <matthias.andree@stud.uni-dortmund.de>
To: linux-kernel@vger.kernel.org
Subject: Re: IBM Desktar disk problem?
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References: <1025873421.16768.20.camel@sonja.de.interearth.com> <Pine.LNX.4.44.0207050801190.10105-100000@hawkeye.luckynet.adm>
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On Fri, 05 Jul 2002, Thunder from the hill wrote:

> ...and tell all the people who got a DTLA (because it's not as expensive=
=20
> as others in some countries, mind France, USA, Germany) to drop their=20
> disks if they want to use Linux, because we're too lazy to find a=20
> solution. That might be cool to you, but we want HARDWARE SUPPORT for=20
> Linux! That's why we're here.
>=20
> There _is_ a solution, we just have to find it.

Might just be that "coincidence" happens more often as "incident"
happens more often. Means: the more drives of that type fails, the more
likely it is someone shows up with a report that the failure is related
to this-and-that. Until someone can reproduce this, assume the TCQ is
Not Guilty in respect to your DTLA failure. Assume it has died a natural
death.

And the "incident often" seems to hold for 75GXP series drives (IBM
DTLA-3070xx).  Out of seven DTLA-307045 (all bought approx. Feb. 2001,
in two different stores) I look after I am getting a MTBF(*) of around
28,000 hours -- which is way lower than what IBM claims.  Two died after
9 months, another one after 16 months. Other IBM drives, DJNA, DPTA, are
way more reliable -- but these are no longer sold.

(S=F8ren Schmidt, FreeBSD ata(4) driver maintainer, says that IBM
acknowledged that DJNA have broken TCQ, sometimes forget to flush a
block -- this will then probably also affect the WDC-420400 and 418....
20G 5400/min and 18G 7200/min drives).


(*) Using Fujitsu's formula:

        total hours of service of all drives
MTBF =3D --------------------------------------
           number of failed drives to date

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