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Date:      Sun, 26 Jan 2003 16:08:31 +0800
From:      Greg Lehey <grog@freebsd.org>
To:        "Daniel O'Connor" <doconnor@gsoft.com.au>
Cc:        David Schultz <dschultz@uclink.berkeley.edu>, Nate Lawson <nate@root.org>, current@freebsd.org
Subject:   Re: I've just had a massive file system crash
Message-ID:  <20030126080830.GE1606@sydney.worldwide.lemis.com>
In-Reply-To: <1043553241.85148.191.camel@chowder.dons.net.au>
References:  <20030125070352.GA933@HAL9000.homeunix.com> <Pine.BSF.4.21.0301251048090.79988-100000@root.org> <20030125213859.GB6339@HAL9000.homeunix.com> <1043553241.85148.191.camel@chowder.dons.net.au>

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On Sunday, 26 January 2003 at 14:24:02 +1030, Daniel O'Connor wrote:
> On Sun, 2003-01-26 at 08:08, David Schultz wrote:
>> Good.  I was referring to IDE in this case, because I assume
>> that's what Greg's laptop uses.  The ATA driver flushes the cache
>> when the device is closed, but I don't think that happens during
>> shutdown.  It probably needs to register a shutdown hook like the
>> SCSI driver.  Also, the driver is a bit optimistic about how long
>> the flush will take; it times out after 5 seconds, whereas the ATA
>> spec says a flush can take up to 30 seconds.
>
> I am wondering if I experienced this problem with my -stable laptop..
>
> I shut it down and then booted it up later to find fsck having a nice
> good chew on the drive (deleting REAMS of files).

Did you use shutdown -p?  If my hypothesis is correct, it's possible
to get this result with shutdown -h if you press the power switch as
soon as the "System halted" message appears, but normally you'd give
it a few seconds longer.  With shutdown -p, it's immediate, modulo
delay.

Greg
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