linux-kernel - Re: New filesystem for Linux

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Message-Id: <200611062040.44868.a1426z@gawab.com>
Date:	Mon, 6 Nov 2006 20:40:44 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

Albert Cahalan wrote:
> On 11/4/06, Jan-Benedict Glaw <jbglaw@...-owl.de> wrote:
> > Albert Cahalan <acahalan@...il.com> wrote:
> > > BTW, a person with disk recovery experience told me that drives
> > > will sometimes reorder the sectors. Sector 42 becomes sector 7732,
> > > sector 880880 becomes sector 12345, etc. The very best filesystems
> > > can handle with without data loss. (for example, ZFS) Merely great
> > > filesystems will at least recognize that the data has been trashed.
> >
> > Uh? This should be transparent to the host computer, so logical sector
> > numbers won't change.
>
> "should be" does not imply "won't"   :-)
>
> On a drive which is capable of remapping sectors, imagine what
> happens if the remapping data itself is corrupted. (the user data
> is perfectly fine and is not being relocated)

I would consider this a defective drive.

> What I mean is that the logical sector numbers not only change,
> but they are the only thing changing. The user data never moves
> to a different physical location, and is never intended to move.
> The user data is perfectly readable. It just appears in the wrong
> place as viewed by the OS.

Just like defective drive electronics; the data is ok, but the electronics 
corrupts the I/O.

No FS could help you there, AFAIK.

BTW, why is this thread not on fsdevel?


Thanks!

--
Al

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