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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: 'Mike Meyer' <mwm-keyword-freebsdhackers2.e313df@mired.org>,
	freebsd-hackers@freebsd.org, 'Mike Meyer' <mwm@mired.org>,
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Subject: RE: Request for opinions - gvinum or ccd?
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> In the case of zfs yes, but not always. Eg you could have a concatenated
> volume. Where you only start writing to the second disk when the 1st is
> full.

i don't know how ZFS exactly allocates space, but i use gconcat with UFS 
and it isn't true.

UFS do "jump" between zones (called cyllinder group) when files are 
written to prevent unevenly filling them, so every zone always has some 
space to allocate.

The effect is that both drives gets quite evenly filled