Flash disks and FFS layout heuristics

Martin Fouts mfouts at danger.com
Tue Apr 1 11:06:36 PDT 2008


If you've asked, I've missed the question.

We tend to size ram and embedded NAND the same. The latest numbers I can
discuss are several years old and were 64mb/64mb. Engineering *always*
wants more of each, but the BOM rules.
 

> -----Original Message-----
> From: Matthew Dillon [mailto:dillon at apollo.backplane.com] 
> Sent: Tuesday, April 01, 2008 10:48 AM
> To: Martin Fouts
> Cc: freebsd-arch at freebsd.org
> Subject: RE: Flash disks and FFS layout heuristics
> 
> :
> :> -----Original Message-----
> :> From: Matthew Dillon [mailto:dillon at apollo.backplane.com]=20
> :> Sent: Monday, March 31, 2008 3:20 PM
> :>=20
> :> For flash storage systems competitive with hard drive storage,=20
> :
> :In embedded systems, it's RAM that flash storage competes 
> with, not hard
> :
> :drive storage.
> :
> :SSD is a completely different engineering problem.
> 
>     You know, I think I've asked this already and you don't 
> have to answer
>     it if you don't want to, but exactly how large a flash 
> device are you
>     working with in your embedded project(s)?
> 
> 					-Matt
> 
> 


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