Date: Tue, 26 Oct 2010 15:33:52 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: freebsd-questions@freebsd.org Subject: fsync: Linux vs FreeBSD Message-ID: <alpine.BSF.2.00.1010261530200.39682@hub.org>
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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? Thanks ... ---- Marc G. Fournier Hub.Org Hosting Solutions S.A. scrappy@hub.org http://www.hub.org Yahoo:yscrappy Skype: hub.org ICQ:7615664 MSN:scrappy@hub.org
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