Date: Mon, 14 Oct 2013 22:46:04 +0200 From: David Demelier <demelier.david@gmail.com> To: Adam Vande More <amvandemore@gmail.com>, CeDeROM <cederom@tlen.pl> Cc: Bruce Cran <bruce@cran.org.uk>, Brad Mettee <bmettee@pchotshots.com>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: SU+J Lost files after a power failure Message-ID: <525C580C.9070201@gmail.com> In-Reply-To: <CA%2BtpaK1_sV6upk37RdkkxWs7YDRTQ-Fw-H%2BzxbN4KBtmzCYATA@mail.gmail.com> References: <525A6831.5070402@gmail.com> <l3gc7e$c91$1@ger.gmane.org> <20131014133953.58f74659@gumby.homeunix.com> <525C1D1C.9050708@gmail.com> <CA%2BtpaK2Pr2po2cQ1yanQK9%2BwLp77SYqYHjxiXaU5FfXwHrkGow@mail.gmail.com> <CAFYkXjn-1wTJcQ4a_fyXCvwh9ukt3%2BdjM2qsMeaH1HhVJNvhiA@mail.gmail.com> <525C2554.7080203@pchotshots.com> <CAFYkXjm8y0Br31_pqRZc0sNFbqCNtKHhjeQuiLXkGT2zxSu0GA@mail.gmail.com> <525C2FBC.4080808@cran.org.uk> <CAFYkXj==tiKSAJh3kkCnonsqAaDg_sHYYEUnfLKWLaR-GD-Nzw@mail.gmail.com> <CA%2BtpaK1_sV6upk37RdkkxWs7YDRTQ-Fw-H%2BzxbN4KBtmzCYATA@mail.gmail.com>
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On 14.10.2013 20:43, Adam Vande More wrote: > On Mon, Oct 14, 2013 at 1:33 PM, CeDeROM <cederom@tlen.pl > <mailto:cederom@tlen.pl>> wrote: > > Thank you for explaining :-) So it looks that it would be sensible to > force filesystem check every n-th mount..? > > > Please explain the logic in which this helps anything. > > > Or to do a filesystem check > after crash..? > > > Already standard behavior as implicitly seen in this thread. > > > Are there any flags like that to mark filesystem > unclean and to force fsck after n-th mount? > > > No and any fs that requires such a system is broken by design. > > > That would assume > disabling journal and soft updates journaling I guess..? > > What would be the best option for best data integrity in case of > crash? > > > mount -o sync or use ZFS. Both require hardware that correctly report > success to fsync. I personnally love ZFS and use it massively on my server, but for a desktop I think this is a real overkill. Also I don't have so much RAM to waste for that. I think UFS is enough, however as a modern operating system I don't expect any data corruption by default using SU+J. The filesystem domain is not a thing I really know deeply, so thanks for all you explanation. PS: the power failure is not the only way that does not shutdown cleanly the system. There are kernel panics, crash and such of course. Those which appears sometimes too. Regards,
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