Re: The ext3 way of journalling

[Ondrej Zary <linux@rainbow-software.org>]

On Tuesday 08 January 2008 21:51:53 Andi Kleen wrote:
> Theodore Tso <tytso@mit.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