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Date:      Sun, 9 Feb 1997 22:02:22 +0100
From:      j@uriah.heep.sax.de (J Wunsch)
To:        freebsd-hackers@freebsd.org (FreeBSD hackers)
Cc:        ponds!rivers@dg-rtp.dg.com (Thomas David Rivers)
Subject:   Re: Copious information on panic: ffs_valloc: dup alloc - IDEAS???
Message-ID:  <Mutt.19970209220222.j@uriah.heep.sax.de>
In-Reply-To: <199702091818.NAA23739@lakes.water.net>; from Thomas David Rivers on Feb 9, 1997 13:18:54 -0500
References:  <199702091818.NAA23739@lakes.water.net>

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As Thomas David Rivers wrote:

>  You're saying the code in newfs.c that sets NTRACKS to 1 and 
> NSECTORS to 4096 would be changed.

Yes, to e.g. 2 * 2048 instead.  It's a mileage number only anyway,
since Poul found out (experimentally) that it just works better than
any (un)real number on today's zone-bit recorded and large cache
disks.

>  If this is so, doesn't that mean that everyone is using a file system
> that is questionable.  Aren't inode reads/writes going to the wrong 
> places (albeit consistently?)

I'm no filesystem expert at all, but this seems to be the case.  The
failure picture matches consistently with the reported MFS troubles
(including mine), and it's probably also responsible for some other
panic PRs you could find in the GNATS database.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)



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