linux-kernel - Re: ATA 4 KiB sector issues.

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Date:	Mon, 8 Mar 2010 14:34:08 -0500
From:	Mike Snitzer <snitzer@...hat.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Tejun Heo <tj@...nel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	Jeff Garzik <jeff@...zik.org>, Mark Lord <kernel@...savvy.com>,
	tytso@....edu, "H. Peter Anvin" <hpa@...or.com>,
	hirofumi@...l.parknet.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, irtiger@...il.com,
	Matthew Wilcox <matthew@....cx>, aschnell@...e.de,
	knikanth@...e.de, jdelvare@...e.de, Karel Zak <kzak@...hat.com>,
	Jim Meyering <jim@...ering.net>
Subject: Re: ATA 4 KiB sector issues.

On Mon, Mar 8, 2010 at 10:18 AM, Martin K. Petersen
<martin.petersen@...cle.com> wrote:
>>>>>> "Tejun" == Tejun Heo <tj@...nel.org> writes:
>
> Tejun> The [Windows Vista/7] partitioner seems to be using 1M as the
> Tejun> basic alignment unit and offsetting from there if explicitly
> Tejun> requested by the drive
>
> Yep.
>
>
> Tejun> Please note that hdparm is misreporting the alignment offset.  It
> Tejun> should be reporting 512 instead of 256 for offset-by-one drives.
>
> Already fixed.  Your hdparm must be old.
>
>
>
> Tejun> Partitioners maybe should only align partitions which will be
> Tejun> used by Linux and default to the traditional layout for others
> Tejun> while allowing explicit override.
>
> I don't think we take the partition type into account.  Karel?
>
>
> Tejun> Reportedly, commonly used partitioners aren't ready to handle
> Tejun> drives larger than 2 TiB in any configuration and alignment isn't
> Tejun> done properly for drives with 4 KiB physical sectors.  4 KiB
> Tejun> logical sector support is broken in both the kernel
>
> Huh, what?  My homedir is on a 4KiB LBS/PBS drive and has been for ~2
> years.
>
>
> Tejun> (need more details and probably a whole section on partitioner
> Tejun> behaviors)
>
> I'm Cc:'ing Karel Zak and Jim Meyering who have been doing all the
> alignment work for fdisk and parted respectively.  Karel, Jim: The full
> writeup is here:
>
>        http://ata.wiki.kernel.org/index.php/ATA_4_KiB_sector_issues
>
> It'd be great if you guys could share what you have been doing to the
> tooling.

I've been keeping track of all the pieces in play, have coordinated
with kzak and jim, and have a summary that offers some amount of macro
detail (at the end I touch on parted and fdisk):

http://people.redhat.com/msnitzer/docs/io-limits.txt
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