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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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