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Date: Wed, 3 Oct 2001 17:17:03 +0100
From: "Stephen C. Tweedie" <sct@redhat.com>
To: Hans Reiser <reiser@namesys.com>
Cc: foner-reiserfs@media.mit.edu, linux-kernel@vger.kernel.org,
        Stephen Tweedie <sct@redhat.com>
Subject: Re: ReiserFS data corruption in very simple configuration
Message-ID: <20011003171703.B5209@redhat.com>
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In-Reply-To: <3BB88B63.AEE6EF8E@namesys.com>; from reiser@namesys.com on Mon, Oct 01, 2001 at 07:27:31PM +0400
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Hi,

On Mon, Oct 01, 2001 at 07:27:31PM +0400, Hans Reiser wrote:
> This is the meaning of metadata journaling: that writes in progress at the time
> of the crash may write garbage, but you won't need to fsck.  You can get this
> behaviour with other filesystems like FFS also.  If you cannot accept those
> terms of service, you might use ext3 with data journaling on, but then your
> performance will be far worse.

ext3 with ordered data writes has performance nearly up to the level
of the fast-and-loose writeback mode for most workloads, and still
avoids ever exposing stale disk blocks after a crash.

Sure, it's a tradeoff, but there are positions between the two
extremes (totally unordered data writes, and totally journaled data
writes) which offer a good compromise here.

Cheers,
 Stephen
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