Date: Mon, 14 Oct 2013 14:51:55 -0400 (EDT) From: Daniel Feenberg <feenberg@nber.org> To: Bruce Cran <bruce@cran.org.uk> Cc: David Demelier <demelier.david@gmail.com>, Adam Vande More <amvandemore@gmail.com>, Brad Mettee <bmettee@pchotshots.com>, FreeBSD Questions <freebsd-questions@freebsd.org>, CeDeROM <cederom@tlen.pl> Subject: Re: SU+J Lost files after a power failure Message-ID: <alpine.LRH.2.03.1310141447520.16969@nber.org> In-Reply-To: <525C2FBC.4080808@cran.org.uk> 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>
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On Mon, 14 Oct 2013, Bruce Cran wrote: > On 10/14/2013 6:16 PM, CeDeROM wrote: >> Isn't there Journal to prevent and reverse such damage? > > Unlike other journaling filesystems, UFS+J only protects the metadata, not > the data itself - i.e. I think it ensures you won't have to run a manual > fsck, but just like plain old UFS files may be truncated as the journal is > replayed. This discussion skirts the critical issue - are files that are not open for writing endangered? No description of the uses of journaling can be considered informative if it doesn't address that explicitly. As a naive user I have always assumed that once closed, a file was invulnerable to improper shutdowns, but this discussion shakes that belief. I expect the answer may be different for SSD and spinning disks. dan feenberg
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