linux-ext4 - Re: [patch] ext2/3: document conditions when reliable operation is possible

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Message-ID: <20090826111537.GB26595@elf.ucw.cz>
Date:	Wed, 26 Aug 2009 13:15:37 +0200
From:	Pavel Machek <pavel@....cz>
To:	Rik van Riel <riel@...hat.com>
Cc:	Neil Brown <neilb@...e.de>, Ric Wheeler <rwheeler@...hat.com>,
	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] ext2/3: document conditions when reliable operation is
	possible

Hi!

>> Ok, can you help? Having a piece of MD documentation explaining the
>> "powerfail nukes entire stripe" and how current filesystems do not
>> deal with that would be nice, along with description when exactly that
>> happens.
>
> Except of course for the inconvenient detail that a power
> failure on a degraded RAID 5 array does *NOT* nuke the
> entire stripe.

Ok, you are right. It will nuke unrelated sector somewhere on the
stripe (one that is "old" and was not recently written) -- which is
still something ext3 can not reliably handle.
									Pavel

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