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Date:	Wed, 22 Jan 2014 15:57:01 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Ric Wheeler <rwheeler@...hat.com>,
	"linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-ide\@vger.kernel.org" <linux-ide@...r.kernel.org>,
	Chris Mason <clm@...com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm\@kvack.org" <linux-mm@...ck.org>,
	"mgorman\@suse.de" <mgorman@...e.de>,
	"linux-fsdevel\@vger.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"akpm\@linux-foundation.org" <akpm@...ux-foundation.org>,
	"lsf-pc\@lists.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes

>>>>> "James" == James Bottomley <James.Bottomley@...senPartnership.com> writes:

>> or even (not today, but some day) reject the IO.

James> I really doubt this.  All 4k drives today do RMW ... I don't see
James> that changing any time soon.

All consumer grade 4K phys drives do RMW.

It's a different story for enterprise drives. The vendors appear to be
divided between 4Kn and 512e with RMW mitigation.

-- 
Martin K. Petersen	Oracle Linux Engineering
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