linux-kernel - writeback cache dangers Re: [ANNOUNCE] Ramback: faster than a speeding bullet

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Message-ID: <20080314190357.GB7151@ucw.cz>
Date:	Fri, 14 Mar 2008 20:03:57 +0100
From:	Pavel Machek <pavel@....cz>
To:	Ric Wheeler <ric@....com>
Cc:	Theodore Tso <tytso@....edu>,
	Benny Amorsen <benny+usenet@...rsen.dk>,
	linux-kernel@...r.kernel.org
Subject: writeback cache dangers Re: [ANNOUNCE] Ramback: faster than a speeding bullet

Hi!

> The ingest rate at the time of a power hit makes a huge 
> difference as well - basically, pulling the power cord 
> when a box is idle is normally not harmful. Try that 
> when you are really pounding on the disks and you will 
> see corruptions a plenty without barriers ;-)

I tried that, and could not get a corrruption. cp -a on big kernel
trees, on sata disk with writeback cache and no barriers... and I
could not cause fs corruption. ext3.

I'd like to demo danger of writeback cache. What should I do?

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