Are you looking at how the IDEMA proposal will be addressed in Linux ?
This beign 4096byte physical with 512byte logical and failure to do a full
8 sector logical write wil cause a read-write-modify to the physical.
Cheers,
On Mon, 1 Jul 2002, Martin Schwidefsky wrote:
> Hi,
> I have a question about the start field in the hd_geometry structure. We used
>
> geo->start = device->major_info->gendisk.part[MINOR(kdev)].start_sect
> >> device->sizes.s2b_shift;
>
> in the old dasd driver but now we use
>
> geo.start = get_start_sect(kdev);
>
> to set the start field. One variant is wrong because the start sector differ if
> the block size is not 512 byte. The first variant calculates the start sector
> based on physical blocks (e.g. with 4096 bytes instead of 512 bytes). The
> second variant calulcates a "soft" start sector based on logical 512 byte
> blocks. Whats correct, first or second variant ?? I tend to favor the first
> variant because struct hd_geometry describes the physical geometry
> (number of heads, sectors, cylinders and start sector) but I am not 100%
> sure about it.
>
> blue skies,
> Martin.
>
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Andre Hedrick
LAD Storage Consulting Group
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