linux-kernel - Re: defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE

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Message-ID: <4B952FB5.2060600@gmail.com>
Date:	Mon, 08 Mar 2010 12:11:17 -0500
From:	jim owens <owens6336@...il.com>
To:	Greg Freemyer <greg.freemyer@...il.com>
CC:	David Newall <davidn@...idnewall.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Jeff Garzik <jeff@...zik.org>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, Akira Fujita <a-fujita@...jp.nec.com>
Subject: Re: defrag deployment status (was Re: [PATCH] ext4: allow defrag
 	(EXT4_IOC_MOVE_EXT) in 32bit compat mode)

Greg Freemyer wrote:
> 
> Jim, I should know this, but is sector 0 on the outside edge, or the inner edge?
> 
> I assume outer so that the linear speed of the platter under the head
> is faster and thus more data per second is passing under the head.

Correct.  AFAIK everyone starts 0 at the outer edge for that reason,
it makes for better benchmarks ;)

When I only worried about a few OEM drives, I used to read the zone
geometry from the drive to see where each speed transition was as the
density decreased.  But that is just not worth the effort in linux
filesystems IMO, it is enough to pack low.

jim
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