Thank you very much for your thorough response, Ted! It helped me out a lot. Also big thanks to Lukáš and Eric! At the moment I am changing every application state update to an atomic "fwrite to tempfile, fsync (or fdatasync) tempfile, rename, fsync parent dir". As the amount of writes I need for application updates is usually small (1-3 fwrites), I decided to update the application state file without an extra journal log for now. But if the amount of necessary writes grows, then I'll introduce a journal log file to minimize the writes needed for each application state update. Or would you consider adding an application level journal anyway? So after following this design pattern for the application and locking the filesystem with FIFREEZE before the power fails, does it matter what flags I set for the ext4 filesystem? Should I stay with the default settings data=ordered and commit=5? Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
