No matter what safeguards are put in place, no file system is ever going
to be 100% safe from corruption from a power interruption. I spent years
on trying to bet embedded file systems as close to 100% safe as
possible. There is always going to be some case where something gets
corrupted when power drops at the wrong time.
The best solution is to keep writes as short as possible (including
writes to the journal). There is going to be some point in the design
and development where the engineer must make the best compromise between
performance and reliability. Shorter writes mean lower performance and
higher reliability. Longer writes mean higher performance and lower
reliability. A write cache in volatile memory (which is what you have on
a hard drive) is always going to be a huge reliability hit, but a huge
performance gain in comparison.
PGA
--
Paul G. Allen, BSIT/SE
Owner, Sr. Engineer
Random Logic Consulting
http://www.randomlogic.com
--
[email protected]
http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
