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SubjectRe: 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.

-hpa


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



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