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Date:      Fri, 24 Jan 2003 23:03:52 -0800
From:      David Schultz <dschultz@uclink.Berkeley.EDU>
To:        Greg Lehey <grog@FreeBSD.ORG>
Cc:        Andy Farkas <andyf@speednet.com.au>, Thomas David Rivers <rivers@dignus.com>, Robert Watson <rwatson@FreeBSD.ORG>, current@FreeBSD.ORG
Subject:   Re: I've just had a massive file system crash
Message-ID:  <20030125070352.GA933@HAL9000.homeunix.com>
In-Reply-To: <20030125043817.GD929@sydney.worldwide.lemis.com>
References:  <20030124093754.GD2402@sydney.worldwide.lemis.com> <Pine.NEB.3.96L.1030124110543.43965D-100000@fledge.watson.org> <20030124093754.GD2402@sydney.worldwide.lemis.com> <200301241153.h0OBrf654388@lakes.dignus.com> <20030124093754.GD2402@sydney.worldwide.lemis.com> <20030124203116.H62832-100000@hewey.af.speednet.com.au> <20030125043817.GD929@sydney.worldwide.lemis.com>

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Thus spake Greg Lehey <grog@FreeBSD.ORG>:
> I've been thinking about what happened, and I have a possibility: the
> session before shutdown included a lot of writing to that file system,
> and I did a shutdown -p.  It's possible that the shutdown powered off
> the system before the disk had flushed its cache.  For the moment I'm
> avoiding shutdown -p, but when I get home I'll try to provoke it
> again.

FreeBSD's ``fix'' for this problem is the same as Windows 98's.
Specifically, there is a 5-second delay (tuneable:
kern.shutdown.poweroff_delay) after all buffers are flushed but
before the power is cut.  Maybe we ought to be sending FLUSH
CACHE commands to all drives and waiting for them to finish.

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