linux-kernel - [RFD] Incremental fsck

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Message-Id: <200801090022.55589.a1426z@gawab.com>
Date:	Wed, 9 Jan 2008 00:22:55 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [RFD] Incremental fsck

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.

Has there been some thought about an incremental fsck?

You know, somehow fencing a sub-dir to do an online fsck?


Thanks for some thoughts!

--
Al

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