linux-kernel - Re: Linux 2.6.29

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Message-ID: <49D0DAD3.6030507@rtr.ca>
Date:	Mon, 30 Mar 2009 10:44:35 -0400
From:	Mark Lord <lkml@....ca>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	"Andreas T.Auer" <andreas.t.auer_lkml_73537@...us.ath.cx>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Ric Wheeler wrote:
> Mark Lord wrote:
>> Ric Wheeler wrote:
..
>> The kernel can crash, and the drives, in practice, will still
>> flush their caches to media by themselves.  Within a second or two.
> 
> Even with desktops, I am not positive that the drive write cache 
> survives a kernel crash without data loss. If I remember correctly, 
> Chris's tests used crashes (not power outages) to display the data 
> corruption that happened without barriers being enabled properly.
..

Linux f/s barriers != drive write caches.

Drive write caches are an almost total non-issue for desktop users,
except on the (very rare) event of a total, sudden power failure
during extended write outs.

Very rare.  Yes, a huge problem for server farms.  No question.
But the majority of Linux systems are probably (still) desktops/notebooks.

Cheers
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