Date: Mon, 23 Jan 2006 21:36:02 +0100
From: Folkert van Heusden <folkert@vanheusden.com>
To: "Theodore Ts'o" <tytso@mit.edu>, John Stoffel <john@stoffel.org>,
       Takashi Sato <sho@tnes.nec.co.jp>, ext2-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org
Subject: Re: [Ext2-devel] Re: [PATCH] ext3: Extends blocksize up to pagesize
Message-ID: <20060123203602.GE10077@vanheusden.com>
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> I think the work done by the U. Wisconsin group for IRON ext3 is the
> way to go (namely checksumming of filesystem metadata, and possibly
> some level of redundancy).  This gives us concrete checks on what metadata
> is valid and the filesystem can avoid any (or further) corruption when
> the hardware goes bad.  The existing ext3 code already has these checks,
> but as filesystems get larger the validity of a block number of an inode
> is harder to check because any value may be correct.  Given that CPU
> speed is growing orders of magnitude faster than disk IO the overhead of
> checksumming is a reasonable thing to do these days (optionally, of course).

Then please make it optionally per mount-point.
E.g.: I don't care if the filesystem of the filestore of my Squid setup
goes bad (mke2fs will fix it just nicely) but I would get upset if its
OS filesystem would get corrupted.


Folkert van Heusden

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