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Date:	Sun, 5 Nov 2006 22:49:03 +0100
From:	Pavel Machek <pavel@....cz>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	Albert Cahalan <acahalan@...il.com>, kangur@...com.net,
	linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

Hi!

> >>>As my PhD thesis, I am designing and writing a filesystem,
> >>>and it's now in a state that it can be released. You can
> >>>download it from http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/
> >>
> >>"Disk that can atomically write one sector (512 bytes) so that
> >>the sector contains either old or new content in case of crash."
> >
> >New drives will soon use 4096-byte sectors. This is a better
> >match for the normal (non-VAX!) page size and reduces overhead.
> 
> The drive (IDE model, SCSI can have larger sector size) will do 
> read-modify-write for smaller writes. So there should be no compatibility 
> issues. (this possibility is in new ATA standard and there is a way how to 

Actually, there are. If you assume powerfail can only destroy 512
bytes... read-modify-write of 4K is going to destroy your "only 512
bytes destroyed" assumption...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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