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

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Message-ID: <20080314093019.GA5966@ucw.cz>
Date:	Fri, 14 Mar 2008 10:30:20 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Benny Amorsen <benny+usenet@...rsen.dk>,
	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet

Hi!

> > Everyone who has write cache turned on for their hard drives is
> > running in a mode similar to ramback anyway (except for when the file
> > system is set to force writes to the platter, but that is rare).
> > Admittedly, software crashes rarely cause the write cache to be lost,
> > but hardware failures do, practically every time.
> 
> On the contrary - the hard disk cache is managed by the barrier logic in
> the kernel, and the ordering even on failures is fairly predictable.

Well, not even all modern hdds support barriers... It would be really
nice to have _safe_ settings by default here...

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