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Date:	Sun, 14 Mar 2010 21:00:50 -0700
From:	"H. Peter Anvin" <>
To:	Denys Vlasenko <>
CC:	Arnd Bergmann <>, Tejun Heo <>,
	"" <>,
	lkml <>,
	Daniel Taylor <>,
	Jeff Garzik <>, Mark Lord <>,,,
	Andrew Morton <>,
	Alan Cox <>,,
	Matthew Wilcox <>,,,
Subject: Re: ATA 4 KiB sector issues.

On 03/14/2010 07:26 PM, Denys Vlasenko wrote:
>> Yes, but it does squat for a flash disk that wants, say, 256K alignment.
> 4K makes sense. 256K not so much.
> 256K alignment is hard to swallow for a lot of reasons anyway.
> Unless the filesystem packs small files into blocks a-la reiserfs,
> 256K block filesystems will be very inefficient for a typical
> storage scenarios.

Noone has talked about using 256K filesystem blocks.  The fact of the
matter, though, is that both flash and RAID have much larger alignment
requirements than a mere 4K for optimal performance.

You might not like it, but that's the way it is.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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