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Date:      Mon, 14 Oct 2013 19:40:48 +0100
From:      Bruce Cran <bruce@cran.org.uk>
To:        CeDeROM <cederom@tlen.pl>
Cc:        David Demelier <demelier.david@gmail.com>, Adam Vande More <amvandemore@gmail.com>, Brad Mettee <bmettee@pchotshots.com>, FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: SU+J Lost files after a power failure
Message-ID:  <525C3AB0.6030609@cran.org.uk>
In-Reply-To: <CAFYkXj==tiKSAJh3kkCnonsqAaDg_sHYYEUnfLKWLaR-GD-Nzw@mail.gmail.com>
References:  <525A6831.5070402@gmail.com>	<l3gc7e$c91$1@ger.gmane.org>	<20131014133953.58f74659@gumby.homeunix.com>	<525C1D1C.9050708@gmail.com>	<CA+tpaK2Pr2po2cQ1yanQK9+wLp77SYqYHjxiXaU5FfXwHrkGow@mail.gmail.com>	<CAFYkXjn-1wTJcQ4a_fyXCvwh9ukt3+djM2qsMeaH1HhVJNvhiA@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>

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On 10/14/2013 7:33 PM, CeDeROM wrote:
> Thank you for explaining :-) So it looks that it would be sensible to
> force filesystem check every n-th mount..? Or to do a filesystem check
> after crash..? Are there any flags like that to mark filesystem
> unclean and to force fsck after n-th mount? 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? That would be helpful for development systems I guess :-)

As I understand it UFS+J gives the same reliability as UFS with a normal 
fsck after a crash, so on a development system the only ways to improve 
the situation would be to mount with the 'sync' option, disable write 
caching on the disk or to switch to a different filesystem like ZFS.

-- 
Bruce Cran



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