linux-ext4 - Re: [patch] document flash/RAID dangers

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Message-ID: <20090826112219.GE26595@elf.ucw.cz>
Date:	Wed, 26 Aug 2009 13:22:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Rik van Riel <riel@...hat.com>
Cc:	Ric Wheeler <rwheeler@...hat.com>, david@...g.hm,
	Theodore Tso <tytso@....edu>, Florian Weimer <fweimer@....de>,
	Goswin von Brederlow <goswin-v-b@....de>,
	Rob Landley <rob@...dley.net>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-ext4@...r.kernel.org, corbet@....net
Subject: Re: [patch] document flash/RAID dangers

On Wed 2009-08-26 00:24:30, Rik van Riel wrote:
> Pavel Machek wrote:
>
>> Look, I don't need full drive failure for this to happen. I can just
>> remove one disk from array. I don't need power failure, I can just
>> press the power button. I don't even need to rebuild anything, I can
>> just write to degraded array.
>>
>> Given that all events are under my control, statistics make little
>> sense here.
>
> I recommend a sledgehammer.
>
> If you want to lose your data, you might as well have some fun.
>
> No need to bore yourself to tears by simulating events that are
> unlikely to happen simultaneously to careful system administrators.

Sledgehammer is hardware problem, and I'm demonstrating
software/documentation problem we have here.
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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