On Tue, 26 Oct 2010 15:33:52 -0300 (ADT) "Marc G. Fournier" <scra...@hub.org> wrote:
> > Someone recently posted on one of the PostgreSQL Blogs concerning > fsync on Linux/Windows/Mac OS X, but failed to make any comments on > any of the BSDs ... the post has to do with how fsync works on the > various OSs, and am curious as to whether or not this is something > that also afflicts us: > > http://rhaas.blogspot.com/2010/10/wal-reliability.html > > >From reading our man page, I see no warnings similar to what the > >other OSs > have, specifically: > > Mac OS X: For applications that require tighter guarantees about the > integrity of their data, Mac OS X provides the F_FULLFSYNC > fcntl > > Linux: If the underlying hard disk has write caching enabled, then the > data may not really be on permanent storage when fsync() / > fdatasync() return. > > So, do we hide the fact, or are, in fact, not afflicted by this? Yes, it is a problem: http://leaf.dragonflybsd.org/mailarchive/kernel/2010-01/msg00007.html There also a paragraph on write cache and filesystem integrity in da(4): http://www.freebsd.org/cgi/man.cgi?query=da&apropos=0&sektion=0&manpath=FreeBSD+8.1-RELEASE&format=html -- Bruce Cran _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
