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Date:      Mon, 14 Oct 2013 20:41:25 +0100
From:      RW <rwmaillists@googlemail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: SU+J Lost files after a power failure
Message-ID:  <20131014204125.6cc4a31e@gumby.homeunix.com>
In-Reply-To: <F2D0FD23-884F-48D4-865B-CE793E2B4F39@mac.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> <F2D0FD23-884F-48D4-865B-CE793E2B4F39@mac.com>

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On Mon, 14 Oct 2013 11:48:18 -0700
Charles Swiger wrote:



> Yes.  Without journalling, you'd normally perform the full
> timeconsuming fsck in the foreground.

Journalling removes the need for the background fsck which only recovers
lost space. 

>  With journalling, it should be
> able to do a journal replay to restore the filesystem to an OK state,

My understanding is that the journal does nothing to restore the
filesystem other than keep track of orphaned memory. In all other
respect it's the job of soft-updates to keep the filesystem in an OK
state. When it doesn't you need a foreground check.

> but sometimes that doesn't restore consistency, in which case it
> usually fires off a background fsck rather than the foreground fsck.

I think if the journal fails, you would really need to run at least a
foreground preen, maybe a full fsck. 



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