linux-kernel - Re: ATA support for 4k sector size

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Message-ID: <yq163iyhy7s.fsf@sermon.lab.mkp.net>
Date:	Wed, 25 Feb 2009 18:51:35 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Matthew Wilcox <matthew@....cx>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, sandeen@...hat.com
Subject: Re: ATA support for 4k sector size

>>>>> "hpa" == H Peter Anvin <hpa@...or.com> writes:

hpa> I wish it was left to people like myself.  Realistically when it
hpa> comes to disks with 4096-byte logical sectors it going to matter
hpa> how the firmware chooses to expose it.

Well. In the short term ATA is going to emulate 512 (at a penalty for
misaligned I/O).  SCSI is switching to 4KB wholesale.

I have a 4KB/4KB drive here that I have had fun booting from the last
few days.

hpa> Most likely, the universe will explode at this time, since very few
hpa> bootloaders can deal with a sector size other than 512 bytes, and
hpa> virtually every partition table format contains a sector size
hpa> dependency, which also means you'll break any mechanical imaging
hpa> solution.

hpa> It's going to hurt :(

Yep, it sucks :|

-- 
Martin K. Petersen	Oracle Linux Engineering
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