linux-kernel - Re: The ext3 way of journalling

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Date:	Tue, 8 Jan 2008 22:03:08 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Theodore Tso <tytso@....edu>, Tuomo Valkonen <tuomov@....fi>,
	linux-kernel@...r.kernel.org
Subject: Re: The ext3 way of journalling

On Tuesday 08 January 2008 21:51:53 Andi Kleen wrote:
> Theodore Tso <tytso@....edu> writes:
> > Now, there are good reasons for doing periodic checks every N mounts
> > and after M months.  And it has to do with PC class hardware.  (Ted's
> > aphorism: "PC class hardware is cr*p").
>
> If these reasons are good ones (some skepticism here) then the correct
> way to really handle this would be to do regular background scrubbing
> during runtime; ideally with metadata checksums so that you can actually
> detect all corruption.
>
> But since fsck is so slow and disks are so big this whole thing
> is a ticking time bomb now. e.g. it is not uncommon to require tens
> of minutes or even hours of fsck time and some server that reboots
> only every few months will eat that when it happens to reboot.
> This means you get a quite long downtime.

That's why I always do "tune2fs -c 0 -i 0" on any new filesystem. It probably 
should be default.

>
> -Andi
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-- 
Ondrej Zary
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