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

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Message-ID: <4B95B5AC.8050101@gmail.com>
Date:	Tue, 09 Mar 2010 11:42:52 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Karel Zak <kzak@...hat.com>
CC:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"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, Jim Meyering <jim@...ering.net>
Subject: Re: ATA 4 KiB sector issues.

Hello, again.

On 03/09/2010 11:34 AM, Tejun Heo wrote:
>>  - parted uses 1MiB alignment for disks with unknown topology, disks
>>    with topology information are aligned to optimal (or minimum) I/O
>>    size (parted >= 2.1)
> 
> This will result in incorrect alignment for drives which lie about the
> physical sector size to work around BIOS/drivers issues (C-1).  It
> would probably be best to align to at least 1MiB.

I misread it.  C-1 would be disks w/o alignment information which will
be aligned to optimal_io_size which again would be 0 and thus 1MiB
alignment.  So, this should work, right?

Thanks.

-- 
tejun
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