Dear Fran & Casper
I'd tend to disagree with that. POSIX/SUS does not guarantee data makes it to disk until you do an fsync() (or open the file with the right flags, or other techniques). If an application REQUIRES that data get to disk, it really MUST DTRT.Indeed; want your data safe? Use: fflush(fp); fsync(fileno(fp)); fclose(fp); and check errors. (It's remarkable how often people get the above sequence wrong and only do something like fsync(fileno(fp)); fclose(fp);
Thanks for clarifying! Seems I really need to check the apps with truss or dtrace to see if they use that sequence. Allow me one more question: why is fflush() required prior to fsync()?
Putting all pieces together this means that if the app doesn't do it it suffered from the problem with UFS anyway just with typically smaller caches, right?
Thanks again Thomas ----------------------------------------------------------------- GPG fingerprint: B1 EE D2 39 2C 82 26 DA A5 4D E0 50 35 75 9E ED _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
