linux-kernel - Re: 2.6.36 io bring the system to its knees

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Message-ID: <AANLkTinYZ2wPeeunFv4Ljm+D9SDLbgzTVmw_P9KQdK16@mail.gmail.com>
Date:	Wed, 10 Nov 2010 18:46:21 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Chinner <david@...morbit.com>, Jens Axboe <axboe@...nel.dk>,
	dave b <db.pub.mail@...il.com>,
	Sanjoy Mahajan <sanjoy@...n.edu>,
	Jesper Juhl <jj@...osbits.net>,
	Chris Mason <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...nel.org>,
	Aidar Kultayev <the.aidar@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Ted Ts'o" <tytso@....edu>, Corrado Zoccolo <czoccolo@...il.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Steven Barrett <damentz@...il.com>
Subject: Re: 2.6.36 io bring the system to its knees

On Wed, Nov 10, 2010 at 5:59 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Nov 9, 2010 at 5:32 PM, Dave Chinner <david@...morbit.com> wrote:
>>
>> Don't forget to mention data=writeback is not the default because if
>> your system crashes or you lose power running in this mode it will
>> *CORRUPT YOUR FILESYSTEM* and you *WILL LOSE DATA*.
>
> You will lose data even with data=ordered. All the data that didn't
> get logged before the crash is lost anyway.

Linus, are you using with data=writeback?

Those of us, who did (without UPS), will never do it again.

Propability of non-trivial FS corruption becomes so much bigger.
I believe from my experience, average number of crashes before
one loses FS becomes single digit number.

With data=ordered, it's quite hard.
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