[Voyage-linux] ext3

[Ben Kochie]

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One option for writing to a flash in a nice pattern would be to use a log 
filesystem.

http://logfs.org/

- -ben

  "UNIX is user-friendly, it's just picky about its friends."

On Tue, 24 Mar 2009, Jeff R. Allen wrote:

>> I don't bother with ext3 since it drastically reduces the lifetime of
>> the CF card.  Also, log files and the like are not written to disk so
>> there is not as much IO as you might think.
>
> Not to be critical, but your response is contradictory and I can't
> make sense of it. Can you clarify?
>
> Some facts:
>  * under voyage, the root is mounted read-only, which means you can
> use it on a CF card with no degradation no matter what filesystem you
> use.
>  * In stock Voyage, files are only written to the CF card when you do
> the explicit sync operation of the stuff in /rw back to /ro, or when
> you explicitly remount the root rw and start scribbling on things with
> your own scripts/servers/etc.
>
> I'm very interested in this right now, because I'm currently
> contemplating what the right mix is between ramdisk and CF disk when
> running a mySQL database. I'm currently leaning towards running it in
> RAM, and flushing to CF card via mysql_copy under app control -- so
> that the app only flushes the database when it knows there's been a
> precious write.
>
> I'm an OpenWRT user too, and I'm considering using a jffs2 overlay for
> my ext2 formatted mysql-dump filesystem, just like OpenWRT does for
> it's entire filesystem.
>
> Anyone got any suggestions for how to safely do regular writes?
>
>  -jeff
>
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> http://list.voyage.hk/mailman/listinfo/voyage-linux
>
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