linux-kernel - Re: tools support for non-512 byte sector sizes

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Date:	Wed, 30 Jul 2008 14:13:52 -0400
From:	Theodore Tso <tytso@....edu>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	Jim Meyering <jim@...ering.net>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matthew Wilcox <matthew@....cx>,
	Ric Wheeler <rwheeler@...hat.com>, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: tools support for non-512 byte sector sizes

On Wed, Jul 30, 2008 at 12:29:22PM -0500, Matt Domsch wrote:
> 2) those that report a 512-byte sector size, but are really a
>    4096-byte size, and the drive does the conversions and
>    read/modify/write.  T10 and T13 are looking to add commands to
>    expose this different underlying physical sector size so the OS
>    could be aware of it.  This is primarily being driven to mitigate
>    any problems that may happen with "legacy" OSs that are not aware
>    of the difference.

As usual, the biggest problem will be "legacy" userspace.  For
example, most partition tools are still generating legacy partition
tables that look like this:

Disk /dev/sda: 255 heads, 63 sectors, 38913 cylinders

Nr AF  Hd Sec  Cyl  Hd Sec  Cyl     Start      Size ID
 1 80   1   1    0 254  63  121         63    1959867 83
 2 00   0   1  122 254  63  619    1959930    8000370 82
 3 00   0   1  620 254  63 1023    9960300  615177045 05
 4 00   0   0    0   0   0    0          0          0 00
 5 00   1   1  620 254  63 1023         63  615176982 8e

Note the starting sector# for the first partition.....

						- Ted
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