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Date:      Fri, 31 Jan 2003 11:48:56 -0800 (PST)
From:      Julian Elischer <julian@elischer.org>
To:        Steve Byan <stephen_byan@maxtor.com>
Cc:        phk@freebsd.org, freebsd-fs@freebsd.org, tech-kern@netbsd.org
Subject:   Re: DEV_B_SIZE 
Message-ID:  <Pine.BSF.4.21.0301311144370.45015-100000@InterJet.elischer.org>
In-Reply-To: <1010FEB6-354F-11D7-B26B-00306548867E@maxtor.com>

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One thign I thought of is that it is not uncommon to 'dd' an entire
filesystem from one partition to another.
If we create a filesystem that is 'aligned' and we copy it to be 
'unalligned', we'd have a sudden performance drop for no immediatly
obvious reason. What was one write, would become a 2-sector read,
modify and 2-sector write. Especially when copying from one failing
drive to another with slightly different characteristics.

The idea isn't bad but I think it should be sold as a 4k sector
drive, with small print saying it can handle 512byte IO
instead of the other way around.





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