[syslinux] [Sugar-devel] Filesystem for SD cards / USB sticks

[H. Peter Anvin]

On 08/31/2009 02:57 AM, Jonas Smedegaard wrote:
> 
>>> I would assume that the any DOS filesystem will continouously rewrite
>>> to the FAT blocks.  Maybe the best choice would be ext4 with the
>>> journal disabled?
>> The increase of data written to the card with journalling enabled is
>> less than 4% for normal operations (up to 42% for very
>> metadata-intensive operations, but then the amount written is low in
>> absolute terms) according to Ted Ts'o [1] (who has quite a number of
>> interesting SSD-related articles in his blog). For me having a
>> journalling filesystem is worth a lot more than just 4% write data
>> increase (I even use data=journal on most systems).
> 
> I know that article, and the reason I still recommend disabling
> journaling is due to that "write amplification effect" also mentioned in
> the article.
> 
> So do you do not care about the write amplification effect, or so you
> assume that SD card and USB sticks have silently solved it similarly to
> the (seemingly high-end) Intel X25-M SSD?
> 

Or he considers protecting the state of the filesystem to be more important.

	-hpa

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