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

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Message-ID: <20090826011605.GS4300@elf.ucw.cz>
Date:	Wed, 26 Aug 2009 03:16:06 +0200
From:	Pavel Machek <pavel@....cz>
To:	Theodore Tso <tytso@....edu>, Ric Wheeler <rwheeler@...hat.com>,
	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!

> 3) Does that mean that you shouldn't use ext3 on RAID drives?  Of
> course not!  First of all, Ext3 still saves you against kernel panics
> and hangs caused by device driver bugs or other kernel hangs.  You
> will lose less data, and avoid needing to run a long and painful fsck
> after a forced reboot, compared to if you used ext2.  You are making

Actually... ext3 + MD RAID5 will still have a problem on kernel
panic. MD RAID5 is implemented in software, so if kernel panics, you
can still get inconsistent data in your array.

I mostly agree with the rest.
								Pavel

-- 
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