[Voyage-linux] Best File System for Flash Data Logging w/ Voyage?

[Albert Lash]

This is a great question, one I'm pondered many times. :-) I usually
stick with ext3, turn off noatime, set /var/lock/, /var/log/,
/var/tmp/, and /tmp/ to tmpfs. There is another feature I'm looking to
try out which spreads out the frequency with which the os commits
writes. From lesswatts.org:

cat /proc/sys/vm/dirty_writeback_centisecs

echo 1500 > /proc/sys/vm/dirty_writeback_centisecs

laptop mode might help too, but that's even foggier for me at the moment.

Let us know what you find out.

On 10/2/07, mgrollman <mgrollman at cox.net> wrote:
> We are looking at using the Voyage 0.4x build for some data logging
> work, where a 2nd or 3rd partition on a CF card is used for recording
> GPS breadcrumb information, which gets swept out once per day.  This
> would likely be less than 15MB per day of i/o, but there are lots of
> little reads and writes to deal with.  As we are comfortable re-building
> the kernel if needed, it is possible to use any number of different file
> systems that Linux supports, including of course the ext 2 default we
> have used with Voyage for a long time.
>
> But is ext2 the best choice for the data logging partition with
> Voyage/Linux?  Compression is not really an issue for us, due to
> cost/size of modern CF media, nor or read speed, but data integrity that
> could be achieved through use of journal might be, as power is not
> always stable in mobile GPS logging applications, as well as CF wear
> leveling and other flash-specific factor.  Has anyone examined this
> question before, with consideration of JFFS2 and other similar systems?
> I understand that most modern CF cards already can perform the wear
> leveling at the controller level within the card, but the journaling
> thing would seem to have some real use.  Has anyone tried ext3, or even
> ReiserFS in a modern CF application?  What would make best sense here?
>
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