linux-ext4 - Re: wishful thinking about atomic, multi-sector or full MD stripe width, writes in storage

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Message-ID: <4AA184D7.1010502@rtr.ca>
Date:	Fri, 04 Sep 2009 17:21:27 -0400
From:	Mark Lord <lkml@....ca>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	Krzysztof Halasa <khc@...waw.pl>,
	Christoph Hellwig <hch@...radead.org>,
	Michael Tokarev <mjt@....msk.ru>, david@...g.hm,
	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	NeilBrown <neilb@...e.de>, Rob Landley <rob@...dley.net>,
	Florian Weimer <fweimer@....de>,
	Goswin von Brederlow <goswin-v-b@....de>,
	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: wishful thinking about atomic, multi-sector or full MD stripe
 width, writes in storage

Ric Wheeler wrote:
..
> You must disable the write cache on these commodity drives *if* the MD 
> RAID level does not support barriers properly.
..

Rather than further trying to cripple Linux on the notebook,
(it's bad enough already)..

How about instead, *fixing* the MD layer to properly support barriers?
That would be far more useful, productive, and better for end-users.

Cheers
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