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Date:      Tue, 15 Oct 2013 14:22:31 +0200
From:      CeDeROM <cederom@tlen.pl>
To:        Daniel Feenberg <feenberg@nber.org>
Cc:        Polytropon <freebsd@edvax.de>, FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: SU+J Lost files after a power failure
Message-ID:  <CAFYkXjmrCwoudev8=2Lgpcv0y3XZsOawUvfpMmFFkF5_Egk+5w@mail.gmail.com>
In-Reply-To: <alpine.LRH.2.03.1310150742370.29524@nber.org>
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> <alpine.LRH.2.03.1310141447520.16969@nber.org> <2351E8C5-4FC0-4AE9-AC21-312DA46C0EE8@mac.com> <20131015073048.83d7bca4.freebsd@edvax.de> <alpine.LRH.2.03.1310150742370.29524@nber.org>

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On Tue, Oct 15, 2013 at 1:47 PM, Daniel Feenberg <feenberg@nber.org> wrote:
> We have a disk-to-disk backup that runs continuously. I have found that if I
> unmount the backup disk and remove it without delay, then sometimes it
> requires an fsck to remount. So I believe that umount does not wait for all
> writes to complete.

This can be observed on USB Mass Storage devices that blink activity
some time even after umount completes...? :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info



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