linux-ext4 - Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

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Message-ID: <20080521194218.GB26780@shareable.org>
Date:	Wed, 21 May 2008 20:42:18 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Theodore Tso <tytso@....edu>, Pavel Machek <pavel@...e.cz>,
	Chris Mason <chris.mason@...cle.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

Andrew Morton wrote:
> >  And as long as your 100% confident that UPS's will never fail,
> > janitors will never accidentally hit the Emergency Power Office
> > switch, and so on.
> 
> Well.  The product of two very small numbers is...

Another unquantified very small number.

You have a UPS, but the first time you discover it's not wired up
properly is when it fails.

This happened recently in a customer's office...  The UPS power wiring
melted, leaving a big stinking hole, and all the servers went down -
quickly.

Another is misconfiguring the UPS daemon so it continues writing to
disk for 30 minutes until the battery runs down...

Like the chance of two disks going wrong in a RAID at the same
time... that would *never* happen would it?

*tip-toes out of the room*

-- Jamie
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