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Date:      Tue, 5 Jun 2007 17:03:45 +0200
From:      Marc "UBM" Bocklet <ubm@u-boot-man.de>
To:        freebsd-stable@freebsd.org
Subject:   gmirror on a disk with data already on it
Message-ID:  <20070605170345.3df2b8ef.ubm@u-boot-man.de>

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Hiho! :-)

The gmirror man page says that if gmirror is used on a disk, the last
sector of that disk is overwritten with the metadata gmirror uses.

So what I would like to know is, how risky is it to mirror a disk which
already has data on it?

Is there a chance that I might render my system unbootable?

Is there any way to find out what data that last sector holds?

Thanks in advance! :-)

Bye
Marc



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