From owner-freebsd-questions  Thu Jan  3  7: 8:40 2002
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Date: Thu, 3 Jan 2002 10:09:43 -0500
From: devin-freebsdquestions@rintrah.org
To: James McNaughton <jtm63@enteract.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: Softupdates & fsck
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References: <019301c1820a$1b07e2b0$0200a8c0@mark2> <20011211070617.A51634@tharmas.rintrah.org> <86adw1lvw8.fsf@jamestown.21stcentury.net>
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In-Reply-To: <86adw1lvw8.fsf@jamestown.21stcentury.net>; from jtm63@enteract.com on Sat, Dec 29, 2001 at 12:32:39PM -0600
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On Sat, Dec 29, 2001 at 12:32:39PM -0600, James McNaughton wrote:
> devin-freebsdquestions@rintrah.org writes:
> 
> <snip>
> 
> > > 
> > > ad0s1a: hard error reading fsbn 656735 of 328304-328415 (ad0s1 bn 656735;
> > > cn 40 tn 224 sn 23) status=59 error=40
> > > 
> > > 
> > > 
> > > CANNOT READ: BLK 328304
> > > 
> > > CONTINUE? [yn] y
> > 
> > This was on / without softupdates. The worst of your errors.
> > 
> > [snip]
> > 
> > > 
> > > ** /dev/ad0s1h
> > 
> > [snip]
> >  
> > > UNREF FILE  I=3166465  OWNER=nobody MODE=100644
> > > 
> > > SIZE=1295 MTIME=Dec  6 12:20 2001
> > > 
> > > RECONNECT? [yn] y
> > 
> > lots of unreferenced files. You'll see that on the softupdates mounted partitions,
> > fsck is only reclaiming unused space by clearing up these unreferenced files.
> > 
> > [snip]
> > > ** Phase 5 - Check Cyl groups
> > > 
> > > FREE BLK COUNT(S) WRONG IN SUPERBLK
> > > 
> > > SALVAGE? [yn] y
> > > 
> > > 
> > > 
> > > SUMMARY INFORMATION BAD
> > > 
> > > SALVAGE? [yn] y
> > 
> > And here you have it. The summary info was bad. It's cleaning up the free blocks
> > incorrectly marked used.
> > 
> > [snip]
> > 
> > The rest of your file systems looked pretty much the same to me. Didn't look like they
> > were a "mess." Just reclaiming unused blocks as is supposed to happen with 
> > softupdates. As others have noted, you can do this in the background in -CURRENT.
> > 
> > --devin
> 
> Do I understand this correctly, that -- except for the file system
> without softupdates -- fsck could have been skipped and the file
> system mounted with no serious consequences? E.g. that a huge file
> system could be immediately reused with only some blocks incorrectly
> allocated and then fsck'ed at a later, more convenient time?
> 

Yes. That is my understanding.

--devin

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