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

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Date:	Thu, 13 Mar 2008 18:20:20 -0800
From:	Daniel Phillips <phillips@...nq.net>
To:	Rik van Riel <riel@...hat.com>
Cc:	Willy Tarreau <w@....eu>, Chris Friesen <cfriesen@...tel.com>,
	Lars Marowsky-Bree <lmb@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Grzegorz Kulewski <kangur@...com.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet

On Thursday 13 March 2008 13:34, Rik van Riel wrote:
> On Wed, 12 Mar 2008 00:17:56 -0800
> Daniel Phillips <phillips@...nq.net> wrote:
> 
> > So we have a flock of people arguing that you can't trust Linux.  Well
> > maybe there are situations were you can't, but what can you trust?
> > Disk firmware?  Bios?  Big maybes everywhere.
> 
> The traditional and proven method to constructing a reliable system is
> to assume that no component can be fully trusted.  This is especially
> true for new code.
> 
> By being paranoid about everything, failures in one component are
> usually contained well enough that one failure is not catastrophic.
> 
> In order for ramback to get appeal with the people who are paranoid
> about data integrity (probably a vast majority of users), you will
> need some guarantees about flush order, etc...

I disagree.  Never mind that it already does provide such guarantees,
just echo 1 >/proc/driver/ramback/name.  But if you want the full
performance you need to satisfy your paranoia at a higher level in
the traditional way: by running two in parallel or whatever.

Daniel 
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