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Date:      Thu, 6 May 1999 16:02:03 -0500 (CDT)
From:      David Scheidt <dscheidt@enteract.com>
To:        Zhihui Zhang <zzhang@cs.binghamton.edu>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: Copies of superblocks in FFS
Message-ID:  <Pine.NEB.3.96.990506155023.47842A-100000@shell-1.enteract.com>
In-Reply-To: <Pine.GSO.3.96.990506161959.15238B-100000@sol.cs.binghamton.edu>

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On Thu, 6 May 1999, Zhihui Zhang wrote:

:But the BIOS always read boot blocks from the beginning of a FreeBSD
:slice, which is the root filesystem space (or can we let other non-root
:filesystems to occupy the beginning of the FreeBSD slice?).

I often build machines with more than one FreeBSD slice, and only one root
filesystem.  
:
:What kind of panic?  The kernel is a trusted program anyway.

One that hoses the in-core copy of the superblock, and then writes it back
out to disk would have this effect.  Never seen this on FreeBSD, but I dealt
with a bunch of NeXTstep machines that would do this on every other panic.
A physical disk failure could casue this too.

David 





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