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Date: Wed, 18 Mar 2009 13:10:47 -0700
From: Tim Kientzle <kientzle@freebsd.org>
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To: Pieter de Goeje <pieter@degoeje.nl>
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Cc: freebsd-hackers@freebsd.org, "Aryeh M. Friedman" <aryeh.friedman@gmail.com>
Subject: Re: is gmirror byte or fs level?
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Pieter de Goeje wrote:
> On Wednesday 18 March 2009 16:49:19 Aryeh M. Friedman wrote:
> 
>>If I have a dual boot system w/ Vista on the first slices and all the 
>>FreeBSD filesystems on the second and then run gmirror on the disk will 
>>the mirror disk also have the Vista slice?
> 
> Yes, gmirror is block level and has no knowledge whatsoever of the filesystems on top of it.

But of course, gmirror works by intercepting
writes to the disk.  Vista does not use gmirror,
so writes from Vista will not be mirrored.
Only writes from FreeBSD to the Vista slice will
get mirrored, which is almost certainly not
what you want.

Tim