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Date: Sun, 6 Jul 2008 08:57:29 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: John Nielsen <lists@jnielsen.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD + ZFS on a production server?
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>
> ZFS on FreeBSD is GEOM-ified. While I believe what Wojciech said about
> needing a full disk is correct under Solaris, it's not the case in

i never said it requires full disk. but it will work very slow sharing a 
disk with non-ZFS things.

>> to say more: zfs set copies could be usable to selectively mirror given
>> data while not mirroring other (using unprotected storage for ZFS).
>> but it's broken. it writes N copies under write, but don't remake
>> copies in case of failure!

which make it almost unusable. in case of any failure you have to copy and 
delete every file to make it actually repaired.