Date: Fri, 26 Sep 2008 22:14:13 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Derek Kuli??ski <takeda@takeda.tk> Cc: freebsd-stable@freebsd.org, Clint Olsen <clint.olsen@gmail.com> Subject: Re: UNEXPECTED SOFT UPDATE INCONSISTENCY; RUN fsck MANUALLY Message-ID: <20080927051413.GA42700@icarus.home.lan> In-Reply-To: <249873145.20080926213341@takeda.tk> References: <20080921213426.GA13923@0lsen.net> <20080921215203.GC9494@icarus.home.lan> <20080921215930.GA25826@0lsen.net> <20080921220720.GA9847@icarus.home.lan> <249873145.20080926213341@takeda.tk>
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On Fri, Sep 26, 2008 at 09:33:41PM -0700, Derek Kuli??ski wrote: > Hello Jeremy, > > Sunday, September 21, 2008, 3:07:20 PM, you wrote: > > > Consider using background_fsck="no" in /etc/rc.conf if you prefer the > > old behaviour. Otherwise, boot single-user then do the fsck. > > Actually what's the advantage of having fsck run in background if it > isn't capable of fixing things? > Isn't it more dangerous to be it like that? i.e. administrator might > not notice the problem; also filesystem could break even further... This question should really be directed at a set of different folks, e.g. actual developers of said stuff (UFS2 and soft updates in specific), because it's opening up a can of worms. I believe it has to do with the fact that there is much faith given to UFS2 soft updates -- the ability to background fsck allows the user to boot their system and have it up and working (able to log in, etc.) in a much shorter amount of time[1]. It makes the assumption that "everything will work just fine", which is faulty. It also gives the impression of a journalled filesystem, which UFS2 soft updates are not. gjournal(8) on the other hand, is, and doesn't require fsck at all[2]. I also think this further adds fuel to the "so why are we enabling soft updates by default and using UFS2 as a filesystem again?" fire. I'm sure someone will respond to this with "So use ZFS and shut up". *sigh* [1]: http://lists.freebsd.org/pipermail/freebsd-questions/2004-December/069114.html [2]: http://lists.freebsd.org/pipermail/freebsd-questions/2008-April/173501.html -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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